Date: Sat, 18 Nov 2006 01:26:59 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: zaitsevbros@mail.ru Cc: freebsd-arm@freebsd.org Subject: Re: At91rm9200 how to start with FreeBSD Message-ID: <20061118.012659.-1876864065.imp@bsdimp.com> In-Reply-To: <7395689.post@talk.nabble.com> References: <7380637.post@talk.nabble.com> <20061116.093638.63053940.imp@bsdimp.com> <7395689.post@talk.nabble.com>
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In message: <7395689.post@talk.nabble.com>
Zuy <zaitsevbros@mail.ru> writes:
: Thank you very much.
: I was realy impressed to get such a quick and detailed answer.
:
: My board includes SD card and 1mb Serial DataFlash. I'm going to use
: dataflash to store bootstrap tools which will load kernel from SD card. But
: your board has 16 MB parallel NOR Flash and 32 MB parallel NAND Flash.
: Why you do not use this flash memory for storing and runing bootstrap tools?
Well, the KB9202B has the 16MB of NOR Flash. The A does not. The
32MB parallel NAND flash isn't available on the custom board that my
company is building. In fact, I was told initially that I'd be lucky
to get a 256kB part, and 240kB would be for an FPGA image...
: You mentioned bootstrap tools such as boot0, boot0iic, boot0spi and boot2.
: Where can I get them?
: Boot0 and boot2 I found in /usr/src/sys/boot but there is no folder for ARM.
: I use FreeBSD 6.0 (6.2 is downloading now) may be that is the reason.
In -current, they can be found in /usr/src/sys/boot/arm/at91, as well
as on 6.2. I believe that the 6.2 versions are less advanced.
: And the last question about compilation process. As you wrote, following
: sequence will give the compiled OS for arm architecture:
: % setenv TARGET arm
: % setenv TARGET_ARCH arm
: % make buildworld
: % make distribution DESTDIR=/mnt
: % make installworld DESTDIR=/mnt
:
: But how the system will know that I need compilation for ARM9. Where it will
: get drivers for basic internal peripherals of AR91RM9200? I think that I
: have to prepare configuration file like I do for compiling kernel for I386,
: but I cannot find it. It looks like they are in the /usr/src/sys/arm/conf. I
: found there two files IQ31244 and SIMICS. Probably they are configuration
: files for IQ31244 and SIMICS development boards. So I think I have to make
: the same file for AT91RM9200. May be you can give me the idea where to get
: such file like an example?
You are correct in that you need a config file. In 6.2 and current
there is a KB920X file that can be used as a basis for this support.
Warner
: Best regards,
: Ivan Zaitsev.
:
:
: M. Warner Losh wrote:
: >
: > In message: <7380637.post@talk.nabble.com>
: > Zuy <zaitsevbros@mail.ru> writes:
: > : How I'm soldering board based on AT91RM9200 with 16mb SDRAM and othe
: > : standartpPeripherals(USB, SD, UART ...). I'm going to run FreeBSD on
: > this
: > : board, but unfortunately I do not know how to start.
: > : I havn't found any files connected with AT91RM9200 in FreeBSD6.0 Stable
: > : source files directory.
: > : I found from this board that freebsd works on at91rm9200.
: >
: > Yes. It does. FreeBSD-current has the most up to date tested code
: > for this platform. FreeBSD 6.2 will contain the tools you need to
: > build it, as well as a slightly less advanced version (the freeze date
: > for 6.2 was a while ago). 6.3 is likely to have even more advanced
: > support.
: >
: > : I will deeply appreciate if someone could give me any information how to
: > : start working with freebsd on this controller. May any type of tutorial
: > is
: > : available.
: > : I also interesting in main spets I have to do to get freeBSD working on
: > : at91rm9200.
: >
: > At this point there's no "how to" tutorial. Each of the different
: > boards based on the at91rm9200 seem to have different boot processes.
: > This makes it hard to write something that's generic, but I may try.
: >
: > Here's the broad outlines.
: >
: > First, your board will need to have some kind of bootstrap media.
: > The atmel part supports parallel flash, iic flash, and spi flash.
: > Once you have the basic bootstrap loaded, you will need to load a
: > kernel and file system from somewhere.
: >
: > Given that your board is small, and that you have only 16MB of SDRAM,
: > I'd recommend using the SD card for your main storage. If you do
: > this, then all you need in your bootstrap is enough storage to load
: > from the SD card, as well as storing the MAC address. The bootloader
: > is responsible for progarmming the NIC's MAC address. The 'boot2'
: > program allows for one to customize how things are done with it and
: > load off of an SD card. It takes about 9kB of space right now. The
: > Kwikbyte KB9202 board that I used has a 16kB IIC EEPROM that this
: > loader will fit into. I use the upper part (last 256bytes) of the IIC
: > to store the MAC address. This program should be fairly easy to
: > modify and adapt to your needs. I've tried to make it as generic
: > possible, but some custom work might be needed.
: >
: > There's some bootstrap tools called boot0, boot0iic and boot0spi that
: > will load and run a program, load and burn to iic an image and load
: > and burn to spi flash respectively. The AT91RM9200 goes into 'baby
: > bird' mode if none of its boot images are good. This is nothing more
: > than xmodem. When I bring a board up, I usually load boot0iic and
: > boot2 using xmodem. It turns out to be quiet simple. Each board has
: > some low-level init that is the hardest part to get right since you
: > have to know the base clock frequency as well as the organization of
: > the SDRAM.
: >
: > Once you have 'boot2' loading from some media, then you need to get it
: > loading a kernel from an SD card. Today, you have to load a kernel
: > linked to be loaded at a physical address (cognet sent me patches to
: > allow virtual too, but my KB9202's iic eeprom is dead). There's a
: > special kernel target call 'trampoline' or 'kernel.tramp' that will
: > create a compressed image suitable for booting (use kernel.gz.tramp).
: >
: > An alternative is to use bootiic or bootspi to load a kernel image
: > from somewhere and jump to it.
: >
: > To make the bootable SD card, I've been using some custom scripts that
: > I've had laying around forever for some semi-embedded FreeBSD/i386
: > work that my company has been doing for the past 10 or so years. Most
: > other people I know do some variation on:
: >
: > # plug in the SD card to a usb whatsit and load umass
: > % fdisk -I da0
: > % disklabel -w -r da0s1 auto
: > % newfs /dev/da0s1a
: > % mount /dev/da0s1a /mnt
: > % cd /usr/src
: > % setenv TARGET arm
: > % setenv TARGET_ARCH arm
: > % make buildworld
: > % make distribution DESTDIR=/mnt
: > % make installworld DESTDIR=/mnt
: > # hack /etc/rc.conf, /etc/fstab and /etc/ttys
: > % umount /mnt
: >
: > But others have also used NanoBSD to automate things somewhat.
: > Freesbie also has some basic cross compilation support. FreeBSD
: > -current will give you the most support, but 6.2-release will have
: > most of the basics, including the build tools. After the RELENG_6
: > branch is unfrozen, I'll be doing another merge of all the goodies
: > that I've done.
: >
: > One caveat. The usb support is minimal at this stage. There's some
: > issues that we're trying to track down that keep it from working. My
: > company doesn't need usb (but that may change after the latest
: > hardware review), so I've spent no energy there.
: >
: > Feel free to ask questions. the more people that ask, the bigger my
: > collection of email on the topic gets, and the easier it will be for
: > me to synthesize a tutorial. Also, if there are areas that I've been
: > vague, please don't hesitate to let me know.
: >
: > Warner
: > _______________________________________________
: > freebsd-arm@freebsd.org mailing list
: > http://lists.freebsd.org/mailman/listinfo/freebsd-arm
: > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org"
: >
: >
:
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