If anybody wants to create a 2.6 driver SD driver for the 7300, here
is what is needed:
ftp://ftp.embeddedARM.com/sdcore.o
ftp://ftp.embeddedARM.com/sdcore.h
sdcore.o is ARM ELF object OS-independent object code that exports
these functions:
sdreset() -- resets core
sdread() -- reads bytes from SD card
sdwrite() -- writes bytes to SD card
More details on API are in the sdcore.h header file. I've used this
API from Linux-userspace and on a NetBSD driver successfully.
I doubt anyone will be able to (or want to) reverse engineer this
hardware and make open-source code for it. It does uses the 4-bit
interface, but it is NOT a standard SD OHCI type interface-- we
looked at using an off-the-shelf (feature-bloated) SD controller for
this, but it turned out to have a 20x larger FPGA footprint than we
had space for.
//Jesse Off
--- In Curtis Monroe <> wrote:
>
> 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 <curtis@> 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 Lappé
> >
> >
> >
> >
>
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