diff mbox series

[U-Boot,v2,03/14] x86: doc: Mention qemu-x86_64 support

Message ID 1539489134-9847-4-git-send-email-bmeng.cn@gmail.com
State Accepted
Commit 6feb2ff502882c687727e2f3e96dd40cb4284007
Delegated to: Bin Meng
Headers show
Series x86: Bring qemu-x86_64 target in travis-ci build/testing | expand

Commit Message

Bin Meng Oct. 14, 2018, 3:52 a.m. UTC 
Currently only 32-bit U-Boot for QEMU x86 is documented. Mention
the 64-bit support.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

---

Changes in v2:
- some rewording in the doc per Heinrich's review comments

 doc/README.x86 | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

Comments

Simon Glass Oct. 19, 2018, 3:26 a.m. UTC | #1 
On 13 October 2018 at 21:52, Bin Meng <bmeng.cn@gmail.com> wrote:
> Currently only 32-bit U-Boot for QEMU x86 is documented. Mention
> the 64-bit support.
>
> Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
>
> ---
>
> Changes in v2:
> - some rewording in the doc per Heinrich's review comments
>
>  doc/README.x86 | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)

Reviewed-by: Simon Glass <sjg@chromium.org>
diff mbox series

Patch

diff --git a/doc/README.x86 b/doc/README.x86
index 8cc4672..22bfbab 100644
--- a/doc/README.x86
+++ b/doc/README.x86
@@ -32,7 +32,7 @@  are supported:
    - Link (Chromebook Pixel)
    - Minnowboard MAX
    - Samus (Chromebook Pixel 2015)
-   - QEMU x86
+   - QEMU x86 (32-bit & 64-bit)
 
 As for loading an OS, U-Boot supports directly booting a 32-bit or 64-bit
 Linux kernel as part of a FIT image. It also supports a compressed zImage.
@@ -376,7 +376,9 @@  QEMU x86 target instructions for bare mode:
 
 To build u-boot.rom for QEMU x86 targets, just simply run
 
-$ make qemu-x86_defconfig
+$ make qemu-x86_defconfig (for 32-bit)
+or
+$ make qemu-x86_64_defconfig (for 64-bit)
 $ make all
 
 Note this default configuration will build a U-Boot for the QEMU x86 i440FX
@@ -479,6 +481,19 @@  Here the kernel (bzImage) is loaded to 01000000 and initrd is to 04000000. Then,
 
 => zboot 01000000 - 04000000 1b1ab50
 
+To run 64-bit U-Boot, qemu-system-x86_64 should be used instead, e.g.:
+$ qemu-system-x86_64 -nographic -bios path/to/u-boot.rom
+
+A specific CPU can be specified via the '-cpu' parameter but please make
+sure the specified CPU supports 64-bit like '-cpu core2duo'. Conversely
+'-cpu pentium' won't work for obvious reasons that the processor only
+supports 32-bit.
+
+Note 64-bit support is very preliminary at this point. Lots of features
+are missing in the 64-bit world. One notable feature is the VGA console
+support which is currently missing, so that you must specify '-nographic'
+to get 64-bit U-Boot up and running.
+
 Updating U-Boot on Edison
 -------------------------
 By default Intel Edison boards are shipped with preinstalled heavily