China DOS Union

I’m using GRUB4DOS version 2007-12-05. The USB flash drive is using USB-ZIP mode (it gets recognized as drive A:). I first boot into DOS and then start GRUB through config.sys. I added the following lines to MENU.LST to boot the floppy disk image frdos.ima, but as a result GRUB did not boot the image and instead booted the USB flash drive again, so it became: machine boots from USB flash drive —— GRUB boot menu —— choose “Start Free-DOS” —— back to the GRUB boot screen again... Can some expert tell me where the problem is?

title Start Free-DOS

map --mem /boot/frdos.ima (fd0)

map --hook

chainloader (fd0)+1

rootnoverify (fd0)

[ Last edited by tyndall on 2007-12-22 at 04:22 PM ]

Choose “Start Free-DOS” —— back to the GRUB boot screen again

When an error occurs it will return to the GRUB menu. There should also be a message like “Press any key to continue...”, but you didn’t report it.

map --mem /boot/frdos.ima (fd0)

This line is prone to errors, because it is uncertain whether your “current working device” contains /boot/frdos.ima.

When starting grub.exe from DOS, if you did not specify --config-file=(fd0)/.../menu.lst, then the current working device is (hd0,0). In that case, using /boot/frdos.ima may fail to find the file. Also, you didn’t say whether your USB flash drive contains the /boot directory.

You can refer to this:

title Start Free-DOS

map --mem (fd0)/boot/frdos.ima (fd0)

map --hook

chainloader (fd0)+1

rootnoverify (fd0)