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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 The bochs video driver also seems to cause problems before the OS is able to
show a display. 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 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 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 when jumping 64-bit mode, at least on AMD machines. This may be a bug in U-Boot