Date: Thu, 15 Feb 2007 20:28:10 +0100 From: Soeren Straarup <xride@x12.dk> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-arm@freebsd.org Subject: Re: At91rm9200 boot? Message-ID: <20070215192810.GC78895@x12.dk> In-Reply-To: <20070215.094642.1645217654.imp@bsdimp.com> References: <45D3119F.4020302@bulinfo.net> <20070214.083339.-1581797982.imp@bsdimp.com> <45D45269.4050509@bulinfo.net> <20070215.094642.1645217654.imp@bsdimp.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, Feb 15, 2007 at 09:46:42AM -0700, M. Warner Losh wrote: > In message: <45D45269.4050509@bulinfo.net> > Krassimir Slavchev <krassi@bulinfo.net> writes: > : M. Warner Losh wrote: > : > In message: <45D3119F.4020302@bulinfo.net> > : > Krassimir Slavchev <krassi@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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20070215192810.GC78895>