[syslinux] cbios disk read problems
H. Peter Anvin
hpa at zytor.com
Thu May 3 13:17:46 PDT 2007
Ram Yalamanchili wrote:
> Hmm, I actually see this issue on both the machines I have here (Dell
> laptop D410 and an AMI bios box). I think, in general there is
> something wrong in the code. The algorithm to calculate CHS for reads
> is the same one Peter wrote for chain.c32, and I confirmed from
> The disk was made entirely with mkdiskimage and mtools/mkfs.vfat. I
> think this is unlikely, but is it possible that the cbios reads dont
> support reading after certain disk region? Reading the 70k'ish sector
> is around offset 34MB.. hmm..
Well, there is the cylinder < 1024 limitation of CBIOS; of course
individual BIOSes can have additional bugs.
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