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{
    "id": 762609,
    "url": "http://patchwork.ozlabs.org/api/patches/762609/?format=api",
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        "name": "U-Boot",
        "link_name": "uboot",
        "list_id": "u-boot.lists.denx.de",
        "list_email": "u-boot@lists.denx.de",
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    "msgid": "<1494864969-7374-3-git-send-email-york.sun@nxp.com>",
    "list_archive_url": null,
    "date": "2017-05-15T16:16:02",
    "name": "[U-Boot,v1,2/9] armv8: layerscape: Eanble falcon boot",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
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        "name": "York Sun",
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        "email": "yorksun@freescale.com"
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    "mbox": "http://patchwork.ozlabs.org/project/uboot/patch/1494864969-7374-3-git-send-email-york.sun@nxp.com/mbox/",
    "series": [],
    "comments": "http://patchwork.ozlabs.org/api/patches/762609/comments/",
    "check": "pending",
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    "tags": {},
    "related": [],
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        "From": "York Sun <york.sun@nxp.com>",
        "To": "U-Boot Mailing List <u-boot@lists.denx.de>",
        "Date": "Mon, 15 May 2017 09:16:02 -0700",
        "Message-ID": "<1494864969-7374-3-git-send-email-york.sun@nxp.com>",
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        "Cc": "Marek Vasut <marex@denx.de>, Jeremy Hunt <Jeremy.Hunt@DEShawResearch.com>,\n\tMichal Simek <michal.simek@xilinx.com>,\n\tHou Zhiqiang <Zhiqiang.Hou@nxp.com>, \n\tVinitha Pillai-B57223 <vinitha.pillai@nxp.com>,\n\tRuchika Gupta <ruchika.gupta@nxp.com>",
        "Subject": "[U-Boot] [PATCH v1 2/9] armv8: layerscape: Eanble falcon boot",
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    "content": "Add jump_to_image_linux() for arm64. Add \"noreturn\" flag to\narmv8_switch_to_el2(). Add hooks to fsl-layerscape to enable falcon\nboot.\n\nSigned-off-by: York Sun <york.sun@nxp.com>\n---\n\n .../arm/cpu/armv8/fsl-layerscape/doc/README.falcon | 86 ++++++++++++++++++++++\n arch/arm/cpu/armv8/fsl-layerscape/spl.c            | 29 ++++++++\n arch/arm/include/asm/system.h                      |  2 +-\n arch/arm/lib/spl.c                                 | 11 +++\n 4 files changed, 127 insertions(+), 1 deletion(-)\n create mode 100644 arch/arm/cpu/armv8/fsl-layerscape/doc/README.falcon",
    "diff": "diff --git a/arch/arm/cpu/armv8/fsl-layerscape/doc/README.falcon b/arch/arm/cpu/armv8/fsl-layerscape/doc/README.falcon\nnew file mode 100644\nindex 0000000..bacff27\n--- /dev/null\n+++ b/arch/arm/cpu/armv8/fsl-layerscape/doc/README.falcon\n@@ -0,0 +1,86 @@\n+Falcon boot option\n+------------------\n+Falcon boot is a short cut boot method for SD/eMMC targets. It skips loading the\n+RAM version U-Boot. Instead, it loads FIT image and boot directly to Linux.\n+CONFIG_SPL_OS_BOOT enables falcon boot. CONFIG_SPL_LOAD_FIT enables the FIT\n+image support (also need CONFIG_SPL_OF_LIBFDT, CONFIG_SPL_FIT and optionally\n+CONFIG_SPL_GZIP).\n+\n+To enable falcon boot, a hook function spl_start_uboot() returns 0 to indicate\n+booting U-Boot is not the first choice. The kernel FIT image needs to be put\n+at CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR. SPL mmc driver reads the header to\n+determine if this is a FIT image. If true, FIT image components are parsed and\n+copied or decompressed (if applicable) to their desitinations. If FIT image is\n+not found, normal U-Boot flow will follow.\n+\n+An important part of falcon boot is to prepare the device tree. A normal U-Boot\n+does FDT fixups when booting Linux. For falcon boot, Linux boots directly from\n+SPL, skipping the normal U-Boot. The device tree has to be prepared in advance.\n+A command \"spl export\" should be called under the normal RAM version U-Boot.\n+It is equivalent to go through \"bootm\" step-by-step until device tree fixup is\n+done. The device tree in memory is the one needed for falcon boot. Falcon boot\n+flow suggests to save this image to SD/eMMC at the location pointed by macro\n+CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR, with maximum size specified by macro\n+CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS. However, when FIT image is used for\n+Linux, the device tree stored in FIT image overwrites the memory loaded by spl\n+driver from these sectors. We could change this loading order to favor the\n+stored sectors. But when secure boot is enabled, these sectors are used for\n+signature header and needs to be loaded before the FIT image. So it is important\n+to understand the device tree in FIT image should be the one actually used, or\n+leave it abscent to favor the stored sectors. It is easier to deploy the FIT\n+image with embedded static device tree to multiple boards.\n+\n+Macro CONFIG_SYS_SPL_ARGS_ADDR serves two purposes. One is the pointer to load\n+the stored sectors to. Normally this is the static device tree. The second\n+purpose is the memory location of signature header for secure boot. After the\n+FIT image is loaded into memory, it is validated against the signature header\n+before individual components are extracted (and optionally decompressed) into\n+their final memory locations, respectivelly. After the validation, the header\n+is no longer used. The static device tree is copied into this location. So\n+this macro is passed as the location of device tree when booting Linux.\n+\n+Steps to prepare static device tree\n+-----------------------------------\n+To prepare the static device tree for Layerscape boards, it is important to\n+understand the fixups in U-Boot. Memory size and location, as well as reserved\n+memory blocks are added/updated. Ethernet MAC addressed are updated. FMan\n+microcode (if used) is embedded in the device tree. Kernel command line and\n+initrd information are embedded. Others including CPU status, boot method,\n+Ethernet port status, etc. are also updated.\n+\n+Following normal booting process, all variables are set, all images are loaded\n+before \"bootm\" command would be issued to boot, run command\n+\n+spl export fdt <address>\n+\n+where the address is the location of FIT image. U-Boot goes through the booting\n+process as if \"bootm start\", \"bootm loados\", \"bootm ramdisk\"... commands but\n+stops before \"bootm go\". There we have the fixed-up device tree in memory.\n+We can check the device tree header by these commands\n+\n+fdt addr <fdt address>\n+fdt header\n+\n+Where the fdt address is the device tree in memory. It is printed by U-Boot.\n+It is useful to know the exact size. One way to extract this static device\n+tree is to save it to eMMC/SD using command in U-Boot, and extract under Linux\n+with these commands, repectivelly\n+\n+mmc write <address> <sector> <sectors>\n+dd if=/dev/mmcblk0 of=<filename> bs=512 skip=<sector> count=<sectors>\n+\n+Note, U-Boot takes values as hexadecimals while Linux takes them as decimals by\n+default. If using NAND or other storage, the commands are slightly different.\n+When we have the static device tree image, we can re-make the FIT image with\n+it. It is important to specify the load addresses in FIT image for every\n+components. Otherwise U-Boot cannot load them correctly.\n+\n+Other things to consider\n+-----------------------\n+Falcon boot skips a lot of initialization in U-Boot. If Linux expects the\n+hardware to be initialized by U-Boot, the related code should be ported to SPL\n+build. For example, if Linux expect Ethernet PHY to be initialized in U-Boot\n+(which is not a common case), the PHY initialization has to be included in\n+falcon boot. This increases the SPL image size and should be handled carefully.\n+If Linux has PHY driver enabled, it still depends on the correct MDIO bus setup\n+in U-Boot. Normal U-Boot sets the MDC ratio to generate a proper clock signal.\ndiff --git a/arch/arm/cpu/armv8/fsl-layerscape/spl.c b/arch/arm/cpu/armv8/fsl-layerscape/spl.c\nindex 2776240..7db1077 100644\n--- a/arch/arm/cpu/armv8/fsl-layerscape/spl.c\n+++ b/arch/arm/cpu/armv8/fsl-layerscape/spl.c\n@@ -116,4 +116,33 @@ void board_init_f(ulong dummy)\n \tgd->arch.tlb_allocated = gd->arch.tlb_addr;\n #endif\t/* CONFIG_SPL_FSL_LS_PPA */\n }\n+\n+#ifdef CONFIG_SPL_OS_BOOT\n+/*\n+ * Return\n+ * 0 if booting into OS is selected\n+ * 1 if booting into U-Boot is selected\n+ */\n+int spl_start_uboot(void)\n+{\n+\tchar s[8];\n+\n+\tenv_init();\n+\tgetenv_f(\"boot_os\", s, sizeof(s));\n+\tif ((s != NULL) && (*s == '1' || *s == 'y' || *s == 'Y' ||\n+\t\t\t    *s == 't' || *s == 'T'))\n+\t\treturn 0;\n+\n+\treturn 1;\n+}\n+#endif\t/* CONFIG_SPL_OS_BOOT */\n+#ifdef CONFIG_SPL_LOAD_FIT\n+int board_fit_config_name_match(const char *name)\n+{\n+\t/* Just empty function now - can't decide what to choose */\n+\tdebug(\"%s: %s\\n\", __func__, name);\n+\n+\treturn 0;\n+}\n+#endif\n #endif /* CONFIG_SPL_BUILD */\ndiff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h\nindex 9c3261c..c37391a 100644\n--- a/arch/arm/include/asm/system.h\n+++ b/arch/arm/include/asm/system.h\n@@ -200,7 +200,7 @@ void __asm_switch_ttbr(u64 new_ttbr);\n  * @entry_point: kernel entry point\n  * @es_flag:     execution state flag, ES_TO_AARCH64 or ES_TO_AARCH32\n  */\n-void armv8_switch_to_el2(u64 args, u64 mach_nr, u64 fdt_addr,\n+void __noreturn armv8_switch_to_el2(u64 args, u64 mach_nr, u64 fdt_addr,\n \t\t\t u64 arg4, u64 entry_point, u64 es_flag);\n /*\n  * Switch from EL2 to EL1 for ARMv8\ndiff --git a/arch/arm/lib/spl.c b/arch/arm/lib/spl.c\nindex 8ff2c50..a9e9cf2 100644\n--- a/arch/arm/lib/spl.c\n+++ b/arch/arm/lib/spl.c\n@@ -7,6 +7,7 @@\n  *\n  * SPDX-License-Identifier:\tGPL-2.0+\n  */\n+\n #include <common.h>\n #include <config.h>\n #include <spl.h>\n@@ -46,6 +47,15 @@ void __weak board_init_f(ulong dummy)\n  * image.\n  */\n #ifdef CONFIG_SPL_OS_BOOT\n+#ifdef CONFIG_ARM64\n+void __noreturn jump_to_image_linux(struct spl_image_info *spl_image)\n+{\n+\tdebug(\"Entering kernel arg pointer: 0x%p\\n\", spl_image->arg);\n+\tcleanup_before_linux();\n+\tarmv8_switch_to_el2((u64)spl_image->arg, 0, 0, 0,\n+\t\t\t    spl_image->entry_point, ES_TO_AARCH64);\n+}\n+#else\n void __noreturn jump_to_image_linux(struct spl_image_info *spl_image)\n {\n \tunsigned long machid = 0xffffffff;\n@@ -61,4 +71,5 @@ void __noreturn jump_to_image_linux(struct spl_image_info *spl_image)\n \tcleanup_before_linux();\n \timage_entry(0, machid, spl_image->arg);\n }\n+#endif\t/* CONFIG_ARM64 */\n #endif\n",
    "prefixes": [
        "U-Boot",
        "v1",
        "2/9"
    ]
}