x86: doc: coreboot: Mention 64-bit Linux distros

Add a little more detail as to why coreboot64 is preferred for booting
Linux distros.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/doc/board/coreboot/coreboot.rst b/doc/board/coreboot/coreboot.rst
index eac82cc..10a251c 100644 (file)
--- a/doc/board/coreboot/coreboot.rst
+++ b/doc/board/coreboot/coreboot.rst
@@ -82,6 +82,8 @@ build in `$CBDIR`::
       -device ahci,id=ahci \
       -device ide-hd,drive=disk,bus=ahci.0 \
 
+This allows booting and installing various distros, many of which are
+64-bit-only, so cannot work with the 32-bit 'coreboot' build.
 
 USB keyboard
 ------------