[syslinux] cbios disk read problems

[H. Peter Anvin]

Ram Yalamanchili wrote:
> On 5/3/07, H. Peter Anvin <hpa at zytor.com> wrote:
>> Well, there is the cylinder < 1024 limitation of CBIOS; of course
>> individual BIOSes can have additional bugs.
> 
> The CHS calculated was: 138, 0, 31 respectively.
> 
> So, i guess thats not the issue. Does the geometry gotten from the
> disk info seem right? While doing the mkdiskimage, the parameters
> were:
> 
> mkdiskimage -4 /dev/sdd 4 64 32
> 
> disk_info->sect is 32, but head is 16 from what i get from the bios.
> Isn't it supposed to be 64 or am I missing something?

Not necessarily.  The BIOS is free to pick its own geometry; that's why
SYSLINUX queries the BIOS geometry at runtime.

	-hpa