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x86: doc: Mention qemu-x86_64 support

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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>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2018-10-13 20:52:03 -07:00
parent dd4611dea4
commit 6feb2ff502
1 changed files with 17 additions and 2 deletions
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19
doc/README.x86
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@ -32,7 +32,7 @@ are supported:
- Link (Chromebook Pixel) - Link (Chromebook Pixel)
- Minnowboard MAX - Minnowboard MAX
- Samus (Chromebook Pixel 2015) - 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 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. 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 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 $ make all
Note this default configuration will build a U-Boot for the QEMU x86 i440FX 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 => 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 Updating U-Boot on Edison
------------------------- -------------------------
By default Intel Edison boards are shipped with preinstalled heavily By default Intel Edison boards are shipped with preinstalled heavily