x86: doc: Document the -cdrom issues I ran into
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>
diff --git a/doc/board/emulation/qemu-x86.rst b/doc/board/emulation/qemu-x86.rst
index 15f56b6..c604e42 100644
--- a/doc/board/emulation/qemu-x86.rst
+++ b/doc/board/emulation/qemu-x86.rst
@@ -193,6 +193,9 @@
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