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Re: [PATCH] Create floppy emulation boot CD with grub-mkimage


From: Christian Franke
Subject: Re: [PATCH] Create floppy emulation boot CD with grub-mkimage
Date: Sun, 10 Feb 2008 13:17:22 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071128 SeaMonkey/1.1.7

Bean wrote:
On Feb 10, 2008 12:53 AM, Christian Franke <...> wrote:
...
Results:

PC: grub_boot_drive=0x9f, but INT13 Extensions reported for 0x9f

VMware: grub_boot_drive=0x9f

VirtualPC: grub_boot_drive=0xef

VirtualBox: grub_boot_drive=0xe0

GRUB_MOD_INIT(biosdisk) detects INT13 Extensions for 0x9f on the real
PC, therefore "(cd0)" does not appear in "ls" output.
Nevertheless, access to (cd0) and everthing else works as expected due
to the default setting of
biosdisk.c::cd_start = 0x9f.

...

I don't know which drive to start scanning for cdrom. 0x9F means at
most 31 hard drives, i think it's fine for the most time.


Agree.

Sorry, my info was wrong, it should read:

PC: Reports INT13 Extensions *not* available for drive 0x9f.

All VMs: INT13 Extensions available for grub_boot_drive.


CD device scanning fails if BIOS reports no INT13 Extensions for the boot CD drive. I will post a patch in a new thread. Please apply your init.c "(cd0" patch also, as it is necessary if grub_boot_drive is not equal to ..._CDROM_START.

Christian





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