At91rm9200 boot?

[Soeren Straarup]

On Thu, Feb 15, 2007 at 01:49:41PM -0700, Warner Losh wrote:
> From: Soeren Straarup <xride at x12.dk>
> Subject: Re: At91rm9200 boot?
> Date: Thu, 15 Feb 2007 20:28:10 +0100
> 
> > 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 ?
> 
> only in my trees.  Atmel gave me a board a couple of weeks ago to add
> support for it, but I've not yet had time to integrate it into the p4
> tree or to -current.  Short term at91rm9200 is what is there and
> supported.
> 
> The work will be at my own pace, since I'm not funded to do it at the
> moment... If that changes, the pace will pick up.
> 
> Warner
> 
> 
> > > : >     (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
> > 

Hmm.. i can't really get started, looked through how linux is beeing booted
via u-boot, but that doesn't seem to be the same for this board:
http://www.mechatronicbrick.dk/index.php?option=com_content&task=view&id=13&Itemid=35
If i wanna test boot it at first without placing anything in flash how can i
then make it boot, supply a patched version of bootspi or should it be boot0spi?
And then tftp the kernel down? and then nfs mount everything?

/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