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x86: doc: Document the -cdrom issues I ran into

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Add a note about using -cdrom with QEMU.

Suggested-by: Bin Meng <bmeng@tinylab.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng@tinylab.org>
This commit is contained in:
Simon Glass 2023-09-01 12:08:23 -06:00 committed by Bin Meng
parent b95bc64b06
commit 9804e572cf
1 changed files with 3 additions and 0 deletions
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doc/board/emulation/qemu-x86.rst
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@ -193,6 +193,9 @@ Linux is selected from grub, e.g. with `debian-12.1.0-i386-netinst.iso`::
The bochs video driver also seems to cause problems before the OS is able to
show a display.
The QEMU `-cdrom` option is intended to work with the original ISO-format
images, not the recently invented ISOHybrid image.
Finally, the use of `-M accel=kvm` is intended to use the native CPU's
virtual-machine features to accelerate operation, but this causes U-Boot to hang
when jumping 64-bit mode, at least on AMD machines. This may be a bug in U-Boot