nanobsd disk info

[Paul Schenkeveld]

Hi,

On Thu, Mar 17, 2005 at 11:51:07AM -0500, Michael W. Lucas wrote:
> Hi,
> 
> I'm obviously missing something here.
> 
> I'm trying to get nanobsd on a 512Mb flash card.  The only changes
> I've made are to set kernconf = net4801 in make.conf and to set the
> Makefile disk geometry variables.  "make" chokes on the disk geometry,
> so I'm assuming I've set it wrong.
> 
> My diskinfo shows as:
> 
> mwl-crash2~;sudo diskinfo -v da0
> da0
>         512             # sectorsize
>         512483840       # mediasize in bytes (489M)
>         1000945         # mediasize in sectors
>         488             # Cylinders according to firmware.
>         64              # Heads according to firmware.
>         32              # Sectors according to firmware.

Somehow these numbers are not consistent:

  488 cyls * 64 heads * 32 secs = 999424 secs

What does dmesg show about da0?

> I tried to put this into the nanobsd/Makefile as:
> 
> from Makefile:
> 
> # Physical disk paramters.  Use diskinfo(8) on the target platform
> # to find the correct numbers.  We assume 512 bytes sectors.
> HD?=64
> SC?=32
> SECTS?=1000945

>...

> + awk 
> 	{
> 	cs = $2 * $3
> 	cyl = $1 / cs
> 	print "g c" cyl " h" $3 " s" $2
> 	dsl = int (($4 + cs - 1) / cs)
> 	csl = int ((cyl - dsl) / 2)
> 	dsl = cyl - csl * 2
> 	print "p 1 165 " $2, csl * cs - $2
> 	print "p 2 165 " $2 + csl * cs, csl * cs - $2
> 	print "p 3 165 " 2 * csl * cs, dsl * cs
> 	}
> 
> + cat /tmp/nanobsd.PaEr1DcL
> g c488.743 h64 s32
> p 1 165 32 493536
> p 2 165 493600 493536
> p 3 165 987136 13809
> + fdisk -i -f /tmp/nanobsd.PaEr1DcL md0
> fdisk: invalid fdisk partition table found
> fdisk: ERROR line 1: incorrect number of geometry args
> ******* Working on device /dev/md0 *******

Sure, the cylinder count as computed above must be an integer, that's
why fdisk complains.

> Any thoughts?
> 
> ==ml

Regards,

Paul Schenkeveld, Consultant
PSconsult ICT Services BV