Date: Sat, 17 Feb 2007 21:10:21 +0100 From: Soeren Straarup <xride@x12.dk> To: Warner Losh <imp@bsdimp.com> Cc: freebsd-arm@freebsd.org Subject: Re: At91rm9200 boot? Message-ID: <20070217201021.GB66059@x12.dk> In-Reply-To: <20070215.134941.104122801.imp@bsdimp.com> References: <45D45269.4050509@bulinfo.net> <20070215.094642.1645217654.imp@bsdimp.com> <20070215192810.GC78895@x12.dk> <20070215.134941.104122801.imp@bsdimp.com>
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On Thu, Feb 15, 2007 at 01:49:41PM -0700, Warner Losh wrote: > From: Soeren Straarup <xride@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@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 ? > > 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
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