At91rm9200 boot?

[Soeren Straarup]

On Thu, Feb 15, 2007 at 09:46:42AM -0700, M. Warner Losh wrote:
> In message: <45D45269.4050509 at bulinfo.net>
>             Krassimir Slavchev <krassi at bulinfo.net> writes:
> : M. Warner Losh wrote:
> : > In message: <45D3119F.4020302 at bulinfo.net>
> : >             Krassimir Slavchev <krassi at bulinfo.net> writes:
> : > : I have board with at91rm9200, 64Mb SDRAM, 4Mb dataflash and 64kb iic.
> : > : There is bootloader installed in iic which boots linux kernel from 
> : > : dataflash.
> : > : What I need to know for this bootloader to be able to boot FreeBSD kernel?
> : >
> : > How to install the FreeBSD kernel in place of the linux kernel
> : > currently in dataflash.
> : >
> : > Depending on the dataflash, you may also be able to do any or all of
> : > the following:
> : >     (1) install the freebsd boot loader that boots from SD cards (boot2)
> : >     (2) install the freebsd boot loader that boots from dataflash (bootspi)
> : >   
> : These boot loaders can't be fitted in the 8kbytes eeprom (24C64).
> 
> Well, they could be made to fit into 8KB, but they don't right now.  A
> lot of effort has been made to make them small.  bootspi likely is the
> easiest candidate, since it is closest.  I tried really hard to make
> boot2 fit into 8k, but ran out of time.  I did manage to slim down the
> boot loaders from about 48k when I started to 9-10k after all was said
> and done.  The at91rm9200 parts have 16k of SRAM, of which 12k are
> useful.
> 
> The newer AT91SAM926x parts have only 4kb of SRAM, so I'm unsure what
> I'll be doing there.

Is there support at all for AT91SAM9260? Or should i stick to
AT91RM9200 ?

> 
> : >     (3) Use the FreeBSD dataflash support to manage this situation.
> : >   
> : Where to find  more information about this support?
> 
> At the moment there's only source.  src/sys/dev/flash/at45d.c has the
> main support for dataflash.  SPI infrastructure is in src/sys/dev/spi
> and src/sys/arm/at91/at91_spi.c.  /dev/flash/spi0, etc, appears when
> these devices are active.  The block size that the dataflash supports
> is, alas, hard coded into at45d.c file at the moment, but I think that
> most parts have at least some support in there.
> 
> Warner

/Soeren

-- 
Soeren Straarup   | aka OZ2DAK aka Xride
FreeBSD committer | FreeBSD since 2.2.6-R
  If a program is not working right, then send a patch