diff mbox series

[2/2] board/sifive: Update hifive_unleashed_defconfig and genimage.cfg

Message ID 1610355672-3008-3-git-send-email-bmeng.cn@gmail.com
State Changes Requested
Headers show
Series board/sifive: Update defconfig and genimage config files | expand

Commit Message

Bin Meng Jan. 11, 2021, 9:01 a.m. UTC
From: Bin Meng <bin.meng@windriver.com>

Update to use the official linux kernel instead of an out-of-tree
kernel, and use the official U-Boot as the bootloader. Provide
two configuration files of genimage for different boot flows:

- Boot from SD card (default)
- Boot from SPI flash

A boot script is generated to automatically boot the distro.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
---

 board/sifive/hifive-unleashed/boot.cmd             |  4 ++
 .../{genimage.cfg => genimage_sdcard.cfg}          | 14 +++--
 board/sifive/hifive-unleashed/genimage_spi-nor.cfg | 25 ++++++++
 .../sifive/hifive-unleashed/linux.config.fragment  | 14 ++---
 board/sifive/hifive-unleashed/post-build.sh        |  2 +
 board/sifive/hifive-unleashed/readme.txt           | 68 +++++++++++++++++-----
 configs/hifive_unleashed_defconfig                 | 32 +++++++---
 7 files changed, 123 insertions(+), 36 deletions(-)
 create mode 100644 board/sifive/hifive-unleashed/boot.cmd
 rename board/sifive/hifive-unleashed/{genimage.cfg => genimage_sdcard.cfg} (51%)
 create mode 100644 board/sifive/hifive-unleashed/genimage_spi-nor.cfg
 create mode 100755 board/sifive/hifive-unleashed/post-build.sh

Comments

Alistair Francis Jan. 11, 2021, 7:08 p.m. UTC | #1
On Mon, Jan 11, 2021 at 1:01 AM Bin Meng <bmeng.cn@gmail.com> wrote:
>
> From: Bin Meng <bin.meng@windriver.com>
>
> Update to use the official linux kernel instead of an out-of-tree
> kernel, and use the official U-Boot as the bootloader. Provide
> two configuration files of genimage for different boot flows:
>
> - Boot from SD card (default)
> - Boot from SPI flash
>
> A boot script is generated to automatically boot the distro.
>
> Signed-off-by: Bin Meng <bin.meng@windriver.com>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>
>  board/sifive/hifive-unleashed/boot.cmd             |  4 ++
>  .../{genimage.cfg => genimage_sdcard.cfg}          | 14 +++--
>  board/sifive/hifive-unleashed/genimage_spi-nor.cfg | 25 ++++++++
>  .../sifive/hifive-unleashed/linux.config.fragment  | 14 ++---
>  board/sifive/hifive-unleashed/post-build.sh        |  2 +
>  board/sifive/hifive-unleashed/readme.txt           | 68 +++++++++++++++++-----
>  configs/hifive_unleashed_defconfig                 | 32 +++++++---
>  7 files changed, 123 insertions(+), 36 deletions(-)
>  create mode 100644 board/sifive/hifive-unleashed/boot.cmd
>  rename board/sifive/hifive-unleashed/{genimage.cfg => genimage_sdcard.cfg} (51%)
>  create mode 100644 board/sifive/hifive-unleashed/genimage_spi-nor.cfg
>  create mode 100755 board/sifive/hifive-unleashed/post-build.sh
>
> diff --git a/board/sifive/hifive-unleashed/boot.cmd b/board/sifive/hifive-unleashed/boot.cmd
> new file mode 100644
> index 0000000..deaedef
> --- /dev/null
> +++ b/board/sifive/hifive-unleashed/boot.cmd
> @@ -0,0 +1,4 @@
> +setenv bootargs earlycon=sbi root=/dev/mmcblk0p3 rootwait
> +load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} boot/Image
> +load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} boot/hifive-unleashed-a00.dtb
> +booti ${kernel_addr_r} - ${fdt_addr_r}
> diff --git a/board/sifive/hifive-unleashed/genimage.cfg b/board/sifive/hifive-unleashed/genimage_sdcard.cfg
> similarity index 51%
> rename from board/sifive/hifive-unleashed/genimage.cfg
> rename to board/sifive/hifive-unleashed/genimage_sdcard.cfg
> index 8eebc52..e7f98a4 100644
> --- a/board/sifive/hifive-unleashed/genimage.cfg
> +++ b/board/sifive/hifive-unleashed/genimage_sdcard.cfg
> @@ -3,15 +3,21 @@ image sdcard.img {
>                 gpt = true
>         }
>
> -       partition bootloader {
> -               image = "fw_payload.bin"
> -               offset = 1M
> -               size = 32M
> +       partition u-boot-spl {
> +               image = "u-boot-spl.bin"
> +               offset = 17K
> +               partition-type-uuid = 5B193300-FC78-40CD-8002-E86C45580B47
> +       }
> +
> +       partition u-boot {
> +               image = "u-boot.itb"
> +               offset = 1041K
>                 partition-type-uuid = 2E54B353-1271-4842-806F-E436D6AF6985
>         }
>
>         partition rootfs {
>                 image = "rootfs.ext4"
>                 partition-type-uuid = 0FC63DAF-8483-4772-8E79-3D69D8477DE4
> +               bootable = true
>         }
>  }
> diff --git a/board/sifive/hifive-unleashed/genimage_spi-nor.cfg b/board/sifive/hifive-unleashed/genimage_spi-nor.cfg
> new file mode 100644
> index 0000000..7f90997
> --- /dev/null
> +++ b/board/sifive/hifive-unleashed/genimage_spi-nor.cfg
> @@ -0,0 +1,25 @@
> +image spi-nor.img {
> +       size = 32M
> +
> +       hdimage {
> +               gpt = true
> +       }
> +
> +       partition u-boot-spl {
> +               image = "u-boot-spl.bin"
> +               offset = 20K
> +               partition-type-uuid = 5B193300-FC78-40CD-8002-E86C45580B47
> +       }
> +
> +       partition u-boot {
> +               image = "u-boot.itb"
> +               offset = 1044K
> +               partition-type-uuid = 2E54B353-1271-4842-806F-E436D6AF6985
> +       }
> +
> +       partition rootfs {
> +               image = "rootfs.ext4"
> +               partition-type-uuid = 0FC63DAF-8483-4772-8E79-3D69D8477DE4
> +               bootable = true
> +       }
> +}
> diff --git a/board/sifive/hifive-unleashed/linux.config.fragment b/board/sifive/hifive-unleashed/linux.config.fragment
> index f4f3840..385a961 100644
> --- a/board/sifive/hifive-unleashed/linux.config.fragment
> +++ b/board/sifive/hifive-unleashed/linux.config.fragment
> @@ -1,16 +1,10 @@
>  CONFIG_HZ_100=y
> -CONFIG_CMDLINE="earlycon=sbi root=/dev/mmcblk0p2 rootwait"
> -CONFIG_DEVTMPFS_MOUNT=y
> -CONFIG_SERIAL_SIFIVE=y
> -CONFIG_SERIAL_SIFIVE_CONSOLE=y
> -CONFIG_SPI=y
> -CONFIG_SPI_SIFIVE=y
>  CONFIG_GPIOLIB=y
>  CONFIG_GPIO_SYSFS=y
>  CONFIG_GPIO_SIFIVE=y
> -CONFIG_MMC=y
> -CONFIG_MMC_SPI=y
> -CONFIG_CLK_U54_PRCI=y
> -CONFIG_CLK_GEMGXL_MGMT=y
> +CONFIG_POWER_RESET_GPIO_RESTART=y
> +CONFIG_MTD=y
> +CONFIG_MTD_BLOCK=y
> +CONFIG_MTD_SPI_NOR=y
>  CONFIG_PWM=y
>  CONFIG_PWM_SIFIVE=y
> diff --git a/board/sifive/hifive-unleashed/post-build.sh b/board/sifive/hifive-unleashed/post-build.sh
> new file mode 100755
> index 0000000..b418120
> --- /dev/null
> +++ b/board/sifive/hifive-unleashed/post-build.sh
> @@ -0,0 +1,2 @@
> +#!/bin/sh
> +cp $BINARIES_DIR/boot.scr $TARGET_DIR/boot/boot.scr
> diff --git a/board/sifive/hifive-unleashed/readme.txt b/board/sifive/hifive-unleashed/readme.txt
> index 8d3fa63..3263913 100644
> --- a/board/sifive/hifive-unleashed/readme.txt
> +++ b/board/sifive/hifive-unleashed/readme.txt
> @@ -28,30 +28,41 @@ Result of the build
>  Once the build has finished you will have the following files:
>
>      output/images/
> +    +-- boot.scr
> +    +-- fw_dynamic.bin
> +    +-- fw_dynamic.elf
>      +-- fw_jump.bin
>      +-- fw_jump.elf
> -    +-- fw_payload.bin
> -    +-- fw_payload.elf
> +    +-- hifive-unleashed-a00.dtb
>      +-- Image
> +    +-- rootfs.cpio
>      +-- rootfs.ext2
>      +-- rootfs.ext4
>      +-- rootfs.tar
>      +-- sdcard.img
> +    +-- u-boot.bin
> +    +-- u-boot.itb
> +    +-- u-boot-spl.bin
>
>
>  Creating a bootable SD card with genimage
>  =========================================
>
> -Buildroot builds a SD card image for you. All you need to do is dd the
> -image to your SD card, which can be done with the following command:
> +By default Buildroot builds a SD card image for you. All you need to do
> +is dd the image to your SD card, which can be done with the following
> +command on your development host:
>
> -  $ sudo dd if=output/images/sdcard.img of=/dev/mmcblk0 bs=4096
> +  $ sudo dd if=output/images/sdcard.img of=/dev/sdb bs=4096
> +
> +The above example command assumes the SD card is accessed via a USB card
> +reader and shows up as /dev/sdb on the host. Adjust it accordingly per
> +your actual setup.
>
>  Booting the SD card on the board
>  ================================
>
>  Make sure that the all DIP switches are set to the off position for
> -default boot mode (MSEL mode = 1111), insert the SD card and power
> +default boot mode (MSEL mode = 1011), insert the SD card and power
>  up the board.
>
>  Connect the USB cable and open minicom (/dev/ttyUSB1, 115200, 8N1).
> @@ -60,16 +71,45 @@ See the 'SiFive HiFive Unleashed Getting Started Guide' for
>  more details (https://www.sifive.com/documentation).
>
>  You will get a warning reported by fdisk when you examine the SD card.
> -This is because the genimage.cfg file doesn't specify the SD card size
> -(as people will naturally have different sized cards), so the
> +This is because the genimage_sdcard.cfg file doesn't specify the SD card
> +size (as people will naturally have different sized cards), so the
>  secondary GPT header is placed after the rootfs rather than at the end
>  of the disk where it is expected to be.
>
>  You will see something like this at boot time:
>
> -[    2.318722] GPT:Primary header thinks Alt. header is not at the end of the disk.
> -[    2.325390] GPT:190496 != 122142719
> -[    2.328843] GPT:Alternate GPT header not at the end of the disk.
> -[    2.334824] GPT:190496 != 122142719
> -[    2.338302] GPT: Use GNU Parted to correct GPT errors.
> -[    2.343456]  mmcblk0: p1 p2
> +[    0.989458] mmc0: host does not support reading read-only switch, assuming write-enable
> +[    0.996772] mmc0: new SDHC card on SPI
> +[    1.001634] mmcblk0: mmc0:0000 SD8GB 7.28 GiB
> +[    1.038079] GPT:Primary header thinks Alt. header is not at the end of the disk.
> +[    1.044759] GPT:52389 != 15264767
> +[    1.048051] GPT:Alternate GPT header not at the end of the disk.
> +[    1.054015] GPT:52389 != 15264767
> +[    1.057323] GPT: Use GNU Parted to correct GPT errors.
> +[    1.062479]  mmcblk0: p1 p2 p3
> +
> +
> +Creating a bootable SPI flash with genimage
> +===========================================
> +
> +Adjust Buildroot configuration by:
> +
> +  $ make menuconfig
> +
> +Change "System configuration" -> "Extra arguments passed to custom scripts"
> +value to "-c board/sifive/hifive-unleashed/genimage_spi-nor.cfg", save the
> +configuration and build. This creates a output/images/spi-nor.img that can
> +be programmed to the on-board SPI flash.
> +
> +Boot the board from the SD card prepared above, stop the U-Boot auto boot,
> +and type the following commands to program the whole SPI flash:
> +
> +  => tftp 82000000 output/images/spi-nor.img
> +  => sf probe
> +  => sf update 82000000 0 2000000
> +
> +Booting the SPI flash on the board
> +==================================
> +
> +Make sure that the all DIP switches are set to the off position for
> +default boot mode (MSEL mode = 0110) to boot from SPI flash.
> diff --git a/configs/hifive_unleashed_defconfig b/configs/hifive_unleashed_defconfig
> index 2457657..d93920c 100644
> --- a/configs/hifive_unleashed_defconfig
> +++ b/configs/hifive_unleashed_defconfig
> @@ -12,29 +12,45 @@ BR2_RISCV_ABI_LP64D=y
>  BR2_SYSTEM_DHCP="eth0"
>  BR2_TARGET_GENERIC_GETTY=y
>  BR2_TARGET_GENERIC_GETTY_PORT="ttySIF0"
> +BR2_ROOTFS_POST_BUILD_SCRIPT="board/sifive/hifive-unleashed/post-build.sh"
>  BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
> -BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/sifive/hifive-unleashed/genimage.cfg"
> +BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/sifive/hifive-unleashed/genimage_sdcard.cfg"
>
>  # Filesystem
> +BR2_TARGET_ROOTFS_CPIO=y
>  BR2_TARGET_ROOTFS_EXT2=y
>  BR2_TARGET_ROOTFS_EXT2_4=y
> +BR2_TARGET_ROOTFS_EXT2_SIZE="24M"
>
> -# Linux headers same as kernel, a 5.1 series
> -BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_1=y
> +# Linux headers same as kernel, a 5.10 series
> +BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_10=y
>
>  # Kernel
>  BR2_LINUX_KERNEL=y
> -BR2_LINUX_KERNEL_CUSTOM_GIT=y
> -BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/alistair23/linux.git"
> -BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="hifive-unleashed-5.1"
> +BR2_LINUX_KERNEL_CUSTOM_VERSION=y
> +BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.10"
>  BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
>  BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/sifive/hifive-unleashed/linux.config.fragment"
>  BR2_LINUX_KERNEL_IMAGE=y
> +BR2_LINUX_KERNEL_DTS_SUPPORT=y
> +BR2_LINUX_KERNEL_INTREE_DTS_NAME="sifive/hifive-unleashed-a00"
> +BR2_LINUX_KERNEL_INSTALL_TARGET=y
>
>  # Bootloader
>  BR2_TARGET_OPENSBI=y
> -BR2_TARGET_OPENSBI_PLAT="sifive/fu540"
> -BR2_TARGET_OPENSBI_LINUX_PAYLOAD=y
> +BR2_TARGET_OPENSBI_PLAT="generic"
> +BR2_TARGET_UBOOT=y
> +BR2_TARGET_UBOOT_CUSTOM_VERSION=y
> +BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2020.10"
> +BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
> +BR2_TARGET_UBOOT_BOARD_DEFCONFIG="sifive_fu540"
> +BR2_TARGET_UBOOT_NEEDS_DTC=y
> +BR2_TARGET_UBOOT_NEEDS_OPENSBI=y
> +BR2_TARGET_UBOOT_FORMAT_ITB=y
> +BR2_TARGET_UBOOT_SPL=y
>
>  # Host tools
>  BR2_PACKAGE_HOST_GENIMAGE=y
> +BR2_PACKAGE_HOST_UBOOT_TOOLS=y
> +BR2_PACKAGE_HOST_UBOOT_TOOLS_BOOT_SCRIPT=y
> +BR2_PACKAGE_HOST_UBOOT_TOOLS_BOOT_SCRIPT_SOURCE="board/sifive/hifive-unleashed/boot.cmd"
> --
> 2.7.4
>
> _______________________________________________
> buildroot mailing list
> buildroot@busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot
Thomas Petazzoni Jan. 16, 2021, 9:42 p.m. UTC | #2
Hello Bin,

On Mon, 11 Jan 2021 17:01:12 +0800
Bin Meng <bmeng.cn@gmail.com> wrote:

> diff --git a/board/sifive/hifive-unleashed/genimage_spi-nor.cfg b/board/sifive/hifive-unleashed/genimage_spi-nor.cfg
> new file mode 100644
> index 0000000..7f90997
> --- /dev/null
> +++ b/board/sifive/hifive-unleashed/genimage_spi-nor.cfg
> @@ -0,0 +1,25 @@
> +image spi-nor.img {
> +	size = 32M
> +
> +	hdimage {
> +		gpt = true
> +	}
> +
> +	partition u-boot-spl {
> +		image = "u-boot-spl.bin"
> +		offset = 20K
> +		partition-type-uuid = 5B193300-FC78-40CD-8002-E86C45580B47
> +	}
> +
> +	partition u-boot {
> +		image = "u-boot.itb"
> +		offset = 1044K
> +		partition-type-uuid = 2E54B353-1271-4842-806F-E436D6AF6985
> +	}
> +
> +	partition rootfs {
> +		image = "rootfs.ext4"
> +		partition-type-uuid = 0FC63DAF-8483-4772-8E79-3D69D8477DE4
> +		bootable = true
> +	}
> +}

This looks strange. You really use a GPT partition table on SPI flash,
and use an ext4 filesystem on a SPI flash ?

Best regards,

Thomas
Bin Meng Jan. 17, 2021, 10:28 a.m. UTC | #3
Hi Thomas,

On Sun, Jan 17, 2021 at 5:42 AM Thomas Petazzoni
<thomas.petazzoni@bootlin.com> wrote:
>
> Hello Bin,
>
> On Mon, 11 Jan 2021 17:01:12 +0800
> Bin Meng <bmeng.cn@gmail.com> wrote:
>
> > diff --git a/board/sifive/hifive-unleashed/genimage_spi-nor.cfg b/board/sifive/hifive-unleashed/genimage_spi-nor.cfg
> > new file mode 100644
> > index 0000000..7f90997
> > --- /dev/null
> > +++ b/board/sifive/hifive-unleashed/genimage_spi-nor.cfg
> > @@ -0,0 +1,25 @@
> > +image spi-nor.img {
> > +     size = 32M
> > +
> > +     hdimage {
> > +             gpt = true
> > +     }
> > +
> > +     partition u-boot-spl {
> > +             image = "u-boot-spl.bin"
> > +             offset = 20K
> > +             partition-type-uuid = 5B193300-FC78-40CD-8002-E86C45580B47
> > +     }
> > +
> > +     partition u-boot {
> > +             image = "u-boot.itb"
> > +             offset = 1044K
> > +             partition-type-uuid = 2E54B353-1271-4842-806F-E436D6AF6985
> > +     }
> > +
> > +     partition rootfs {
> > +             image = "rootfs.ext4"
> > +             partition-type-uuid = 0FC63DAF-8483-4772-8E79-3D69D8477DE4
> > +             bootable = true
> > +     }
> > +}
>
> This looks strange. You really use a GPT partition table on SPI flash,
> and use an ext4 filesystem on a SPI flash ?
>

When booting from SPI flash, the GPT partition is required by the ZSBL
on the board to load U-Boot SPL images. The kernel still uses ext4 on
the SD card as the rootfs. The SPI flash is just the backup for the
rootfs.

Regards,
Bin
Thomas Petazzoni Jan. 23, 2021, 9:01 p.m. UTC | #4
Hello,

On Sun, 17 Jan 2021 18:28:11 +0800
Bin Meng <bmeng.cn@gmail.com> wrote:

> > > +     partition rootfs {
> > > +             image = "rootfs.ext4"
> > > +             partition-type-uuid = 0FC63DAF-8483-4772-8E79-3D69D8477DE4
> > > +             bootable = true
> > > +     }
> > > +}  
> >
> > This looks strange. You really use a GPT partition table on SPI flash,
> > and use an ext4 filesystem on a SPI flash ?
> >  
> 
> When booting from SPI flash, the GPT partition is required by the ZSBL
> on the board to load U-Boot SPL images. The kernel still uses ext4 on
> the SD card as the rootfs. The SPI flash is just the backup for the
> rootfs.

Then why does your SPI flash image contains a root filesystem partition ?

Thomas
diff mbox series

Patch

diff --git a/board/sifive/hifive-unleashed/boot.cmd b/board/sifive/hifive-unleashed/boot.cmd
new file mode 100644
index 0000000..deaedef
--- /dev/null
+++ b/board/sifive/hifive-unleashed/boot.cmd
@@ -0,0 +1,4 @@ 
+setenv bootargs earlycon=sbi root=/dev/mmcblk0p3 rootwait
+load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} boot/Image
+load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} boot/hifive-unleashed-a00.dtb
+booti ${kernel_addr_r} - ${fdt_addr_r}
diff --git a/board/sifive/hifive-unleashed/genimage.cfg b/board/sifive/hifive-unleashed/genimage_sdcard.cfg
similarity index 51%
rename from board/sifive/hifive-unleashed/genimage.cfg
rename to board/sifive/hifive-unleashed/genimage_sdcard.cfg
index 8eebc52..e7f98a4 100644
--- a/board/sifive/hifive-unleashed/genimage.cfg
+++ b/board/sifive/hifive-unleashed/genimage_sdcard.cfg
@@ -3,15 +3,21 @@  image sdcard.img {
 		gpt = true
 	}
 
-	partition bootloader {
-		image = "fw_payload.bin"
-		offset = 1M
-		size = 32M
+	partition u-boot-spl {
+		image = "u-boot-spl.bin"
+		offset = 17K
+		partition-type-uuid = 5B193300-FC78-40CD-8002-E86C45580B47
+	}
+
+	partition u-boot {
+		image = "u-boot.itb"
+		offset = 1041K
 		partition-type-uuid = 2E54B353-1271-4842-806F-E436D6AF6985
 	}
 
 	partition rootfs {
 		image = "rootfs.ext4"
 		partition-type-uuid = 0FC63DAF-8483-4772-8E79-3D69D8477DE4
+		bootable = true
 	}
 }
diff --git a/board/sifive/hifive-unleashed/genimage_spi-nor.cfg b/board/sifive/hifive-unleashed/genimage_spi-nor.cfg
new file mode 100644
index 0000000..7f90997
--- /dev/null
+++ b/board/sifive/hifive-unleashed/genimage_spi-nor.cfg
@@ -0,0 +1,25 @@ 
+image spi-nor.img {
+	size = 32M
+
+	hdimage {
+		gpt = true
+	}
+
+	partition u-boot-spl {
+		image = "u-boot-spl.bin"
+		offset = 20K
+		partition-type-uuid = 5B193300-FC78-40CD-8002-E86C45580B47
+	}
+
+	partition u-boot {
+		image = "u-boot.itb"
+		offset = 1044K
+		partition-type-uuid = 2E54B353-1271-4842-806F-E436D6AF6985
+	}
+
+	partition rootfs {
+		image = "rootfs.ext4"
+		partition-type-uuid = 0FC63DAF-8483-4772-8E79-3D69D8477DE4
+		bootable = true
+	}
+}
diff --git a/board/sifive/hifive-unleashed/linux.config.fragment b/board/sifive/hifive-unleashed/linux.config.fragment
index f4f3840..385a961 100644
--- a/board/sifive/hifive-unleashed/linux.config.fragment
+++ b/board/sifive/hifive-unleashed/linux.config.fragment
@@ -1,16 +1,10 @@ 
 CONFIG_HZ_100=y
-CONFIG_CMDLINE="earlycon=sbi root=/dev/mmcblk0p2 rootwait"
-CONFIG_DEVTMPFS_MOUNT=y
-CONFIG_SERIAL_SIFIVE=y
-CONFIG_SERIAL_SIFIVE_CONSOLE=y
-CONFIG_SPI=y
-CONFIG_SPI_SIFIVE=y
 CONFIG_GPIOLIB=y
 CONFIG_GPIO_SYSFS=y
 CONFIG_GPIO_SIFIVE=y
-CONFIG_MMC=y
-CONFIG_MMC_SPI=y
-CONFIG_CLK_U54_PRCI=y
-CONFIG_CLK_GEMGXL_MGMT=y
+CONFIG_POWER_RESET_GPIO_RESTART=y
+CONFIG_MTD=y
+CONFIG_MTD_BLOCK=y
+CONFIG_MTD_SPI_NOR=y
 CONFIG_PWM=y
 CONFIG_PWM_SIFIVE=y
diff --git a/board/sifive/hifive-unleashed/post-build.sh b/board/sifive/hifive-unleashed/post-build.sh
new file mode 100755
index 0000000..b418120
--- /dev/null
+++ b/board/sifive/hifive-unleashed/post-build.sh
@@ -0,0 +1,2 @@ 
+#!/bin/sh
+cp $BINARIES_DIR/boot.scr $TARGET_DIR/boot/boot.scr
diff --git a/board/sifive/hifive-unleashed/readme.txt b/board/sifive/hifive-unleashed/readme.txt
index 8d3fa63..3263913 100644
--- a/board/sifive/hifive-unleashed/readme.txt
+++ b/board/sifive/hifive-unleashed/readme.txt
@@ -28,30 +28,41 @@  Result of the build
 Once the build has finished you will have the following files:
 
     output/images/
+    +-- boot.scr
+    +-- fw_dynamic.bin
+    +-- fw_dynamic.elf
     +-- fw_jump.bin
     +-- fw_jump.elf
-    +-- fw_payload.bin
-    +-- fw_payload.elf
+    +-- hifive-unleashed-a00.dtb
     +-- Image
+    +-- rootfs.cpio
     +-- rootfs.ext2
     +-- rootfs.ext4
     +-- rootfs.tar
     +-- sdcard.img
+    +-- u-boot.bin
+    +-- u-boot.itb
+    +-- u-boot-spl.bin
 
 
 Creating a bootable SD card with genimage
 =========================================
 
-Buildroot builds a SD card image for you. All you need to do is dd the
-image to your SD card, which can be done with the following command:
+By default Buildroot builds a SD card image for you. All you need to do
+is dd the image to your SD card, which can be done with the following
+command on your development host:
 
-  $ sudo dd if=output/images/sdcard.img of=/dev/mmcblk0 bs=4096
+  $ sudo dd if=output/images/sdcard.img of=/dev/sdb bs=4096
+
+The above example command assumes the SD card is accessed via a USB card
+reader and shows up as /dev/sdb on the host. Adjust it accordingly per
+your actual setup.
 
 Booting the SD card on the board
 ================================
 
 Make sure that the all DIP switches are set to the off position for
-default boot mode (MSEL mode = 1111), insert the SD card and power
+default boot mode (MSEL mode = 1011), insert the SD card and power
 up the board.
 
 Connect the USB cable and open minicom (/dev/ttyUSB1, 115200, 8N1).
@@ -60,16 +71,45 @@  See the 'SiFive HiFive Unleashed Getting Started Guide' for
 more details (https://www.sifive.com/documentation).
 
 You will get a warning reported by fdisk when you examine the SD card.
-This is because the genimage.cfg file doesn't specify the SD card size
-(as people will naturally have different sized cards), so the
+This is because the genimage_sdcard.cfg file doesn't specify the SD card
+size (as people will naturally have different sized cards), so the
 secondary GPT header is placed after the rootfs rather than at the end
 of the disk where it is expected to be.
 
 You will see something like this at boot time:
 
-[    2.318722] GPT:Primary header thinks Alt. header is not at the end of the disk.
-[    2.325390] GPT:190496 != 122142719
-[    2.328843] GPT:Alternate GPT header not at the end of the disk.
-[    2.334824] GPT:190496 != 122142719
-[    2.338302] GPT: Use GNU Parted to correct GPT errors.
-[    2.343456]  mmcblk0: p1 p2
+[    0.989458] mmc0: host does not support reading read-only switch, assuming write-enable
+[    0.996772] mmc0: new SDHC card on SPI
+[    1.001634] mmcblk0: mmc0:0000 SD8GB 7.28 GiB
+[    1.038079] GPT:Primary header thinks Alt. header is not at the end of the disk.
+[    1.044759] GPT:52389 != 15264767
+[    1.048051] GPT:Alternate GPT header not at the end of the disk.
+[    1.054015] GPT:52389 != 15264767
+[    1.057323] GPT: Use GNU Parted to correct GPT errors.
+[    1.062479]  mmcblk0: p1 p2 p3
+
+
+Creating a bootable SPI flash with genimage
+===========================================
+
+Adjust Buildroot configuration by:
+
+  $ make menuconfig
+
+Change "System configuration" -> "Extra arguments passed to custom scripts"
+value to "-c board/sifive/hifive-unleashed/genimage_spi-nor.cfg", save the
+configuration and build. This creates a output/images/spi-nor.img that can
+be programmed to the on-board SPI flash.
+
+Boot the board from the SD card prepared above, stop the U-Boot auto boot,
+and type the following commands to program the whole SPI flash:
+
+  => tftp 82000000 output/images/spi-nor.img
+  => sf probe
+  => sf update 82000000 0 2000000
+
+Booting the SPI flash on the board
+==================================
+
+Make sure that the all DIP switches are set to the off position for
+default boot mode (MSEL mode = 0110) to boot from SPI flash.
diff --git a/configs/hifive_unleashed_defconfig b/configs/hifive_unleashed_defconfig
index 2457657..d93920c 100644
--- a/configs/hifive_unleashed_defconfig
+++ b/configs/hifive_unleashed_defconfig
@@ -12,29 +12,45 @@  BR2_RISCV_ABI_LP64D=y
 BR2_SYSTEM_DHCP="eth0"
 BR2_TARGET_GENERIC_GETTY=y
 BR2_TARGET_GENERIC_GETTY_PORT="ttySIF0"
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/sifive/hifive-unleashed/post-build.sh"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
-BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/sifive/hifive-unleashed/genimage.cfg"
+BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/sifive/hifive-unleashed/genimage_sdcard.cfg"
 
 # Filesystem
+BR2_TARGET_ROOTFS_CPIO=y
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="24M"
 
-# Linux headers same as kernel, a 5.1 series
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_1=y
+# Linux headers same as kernel, a 5.10 series
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_10=y
 
 # Kernel
 BR2_LINUX_KERNEL=y
-BR2_LINUX_KERNEL_CUSTOM_GIT=y
-BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/alistair23/linux.git"
-BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="hifive-unleashed-5.1"
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.10"
 BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/sifive/hifive-unleashed/linux.config.fragment"
 BR2_LINUX_KERNEL_IMAGE=y
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="sifive/hifive-unleashed-a00"
+BR2_LINUX_KERNEL_INSTALL_TARGET=y
 
 # Bootloader
 BR2_TARGET_OPENSBI=y
-BR2_TARGET_OPENSBI_PLAT="sifive/fu540"
-BR2_TARGET_OPENSBI_LINUX_PAYLOAD=y
+BR2_TARGET_OPENSBI_PLAT="generic"
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2020.10"
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="sifive_fu540"
+BR2_TARGET_UBOOT_NEEDS_DTC=y
+BR2_TARGET_UBOOT_NEEDS_OPENSBI=y
+BR2_TARGET_UBOOT_FORMAT_ITB=y
+BR2_TARGET_UBOOT_SPL=y
 
 # Host tools
 BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_UBOOT_TOOLS=y
+BR2_PACKAGE_HOST_UBOOT_TOOLS_BOOT_SCRIPT=y
+BR2_PACKAGE_HOST_UBOOT_TOOLS_BOOT_SCRIPT_SOURCE="board/sifive/hifive-unleashed/boot.cmd"