Maybe I missed it, seems that post only talks about someone demoing an SD
driver they made for a TI chip, not making a TS SD driver.
There are a few SD drivers out there. And a lot of SD information has leaked.
I even recall seeing some advanced SD code in the 2.6 Linux Kernel. I just
don't know what the interface on the TS boards is?
Is it a simple GPIO interface? self timed? CRC generation? etc. etc.
Most SD drivers use an SPI interface. Its backwards compatible with the MMC
interface which is open. The faster 4 pin interface is proprietary. But there
is info out there about it.
Some links to SD and MMC code and hardware:
http://www.sandisk.com/Oem/Manuals/
http://en.wikipedia.org/wiki/Secure_Digital_Card
http://www.mmca.org/home
http://mmc.drzeus.cx/wiki/Welcome
http://wiki.openwrt.org/OpenWrtDocs/Customizing#head-00b294c0c885db1d544fbfcd48e9367d20b38b5a
http://homepage.ntlworld.com/seanellis/mmcserial.htm
http://www.captain.at/electronics/pic-mmc/
http://www.captain.at/electronic-atmega-mmc.php
http://duff.dk/wrt54gs/
http://www.allaboutjake.com/network/linksys/wrt54g/hack/
http://www.microchipc.com/sourcecode/#mmc
http://lwn.net/Articles/7176/
ftp://ftp.gwdg.de/pub/linux/handhelds/projects/mmc/
http://www.sparkfun.com/commerce/product_info.php?products_id=136
-Curtis.
On October 2, 2006 02:31 pm, dustinharriman wrote:
> Hi Curtis,
>
> It seems someone has already reverse engineered the SD driver. Some
> guy named "James" from the debian-arm mailing list tells a story:
> http://lists.debian.org/debian-arm/2006/07/msg00050.html
>
> IMHO, it would be a great idea if Technologic Systems doled out some
> complimentary TS-7300's to people like you (as well as Riku Viopio,
> Wookey, Lennert Buytenhek and the Debian Developers at ArmEabiPort
> (http://wiki.debian.org/ArmEabiPort), as it seems like a very tangled
> mess to try to make generalized support in Debian for all the
> different types of arm cpus out there, as they have widely differing
> features in the cpus that need to be treated differently (like
> Maverickcrunch).
>
> I guess I've been spoiled with the ease of compiling and installing
> kernels on i386, where I just choose one cpu-specific option like "AMD
> Duron" and everything just magically works as expected from there.
>
> I can be convinced to offer login access to my TS-7300 if developers
> have a specific task they could figure out that would go a long way to
> untangling this mess (and agree to send the patches upstream to Debian
> or the linux kernel where it belongs under GPL protection)
>
> --- In Curtis Monroe <> wrote:
>
> > In general you use the existing TS-BOOTROM and RedBoot to boot your
> new kernel
> > from TFTP. This makes changes faster, and limits the chances of
> corrupting
> > your board. Once your happy everything works then you can flash the
> kernel.
>
> Earlier models than the TS-7300 seem to have Redboot (allowing you to
> boot from various places like TFTP), but the TS-7300 seems to be only
> able to boot straight from an SD card. From my blog entry on this here:
> http://ca.blog.360.yahoo.com/blog-RkGSoVA1brWtXrVH9Gr5CzgVujwwGg--?cq=1&p=11
>
> "There is no kind of bios whatsoever on the TS-7300 that gives you
> flexibility when you're booting. In other words, TS-7300 makes very
> simplistic assumptions when booting. Here are those assumptions in a
> nutshell:
> -When you power on the TS-7300, an SD card must be in the first slot.
> -The SD card it will boot from must be formatted just right, having
> special partitioning.
> -The MBR must contain special code to quickly jump to the first
> partition.
> -The first partition must contain the kernel.
> -The second partition must contain the initrd.
> -That initrd must contain the driver to support the SD card.
> -The third partition must contain the / filesystem.
>
> More details on this boot process are in the TS-7300 manual (See
> Section 2.3, which details the boot sequence):
> http://www.embeddedarm.com/Manuals/ts-7300-manual-rev1.1.pdf";
>
> Please correct me if I'm wrong ;)
>
> Thanks for the reply,
> Dustin Harriman
>
> My Blog: http://ca.blog.360.yahoo.com/dustinharriman
> RSS Feed:
> http://ca.blog.360.yahoo.com/rss-RkGSoVA1brWtXrVH9Gr5CzgVujwwGg--?cq=1
>
> "Freedom is not the capacity to do whatever we please; freedom is the
> capacity to make intelligent choices" -Francis Moore LappÃ
>
>
>
>
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