[PATCH] x86: doc: Document the -cdrom issues I ran into

[Simon Glass]

Add a note about using -cdrom with QEMU.

Suggested-by: Bin Meng <bmeng at tinylab.org>
Signed-off-by: Simon Glass <sjg at chromium.org>
---

 doc/board/emulation/qemu-x86.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/board/emulation/qemu-x86.rst b/doc/board/emulation/qemu-x86.rst
index 15f56b6bc70..c604e42990e 100644
--- a/doc/board/emulation/qemu-x86.rst
+++ b/doc/board/emulation/qemu-x86.rst
@@ -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
-- 
2.42.0.283.g2d96d420d3-goog