How can I disable DMA on boot by default?

GENERAL Help
1

I am booting to a Compact Flash card, and can’t use DMA. I can boot by pressing Esc for .altboot, but how do I make this permanent?
Thanks,
CP

2

just cp .altboot to .boot

3

I copied /.altboot to /.boot but nothing changed. I still have to hit ESC. Are these the wrong files?
Thanks,
CP

4

Nope. All hitting esc does is cause the loader to use /.altboot rather than /.boot. If you copied them over, then it “should” work.

Confirm they are now the same file:

cksum /.*boot

Rick…

5

cksum /.*boot

3168122644 727052 /.altboot
3168122644 727052 /.boot

When I don’t type ESC I get .altboot…S

6

that’s interesting. this message means
/.boot was read, but it doesn’t look like a valid image (lacks STARTUP_HDR_SIGNATURE) . Given that the cksum is the same between .altboot and .boot, I don’t know why the Alt boot works fine. Something must be screwed up…

7

Any ideas? Are there any other differences between booting with .altboot besides the boot image?

8

Try disabling UDMA in the bios settings. And other settings too, Eg: PnP OS.

Try running a cksum over your install CDROM, it should give 82346462 549060608.

9

I checked what you said and everything is ok. But I don’t think those could have been the problem because it installed file since it works fine when I choose .altboot.

10

I have a pc-104 with a compact flash, and I did:

cp /.boot /.old_boot
cp /.altboot /.old_altboot
cp /.old_boot /.altboot
cp /.old_altboot /.boot

And it does work.

One question, Isn’t it possible to enable DMA booting to a Compact Flash?