Hi --
--- In Daniel Smolik <> wrote:
>
> janne.kario napsal(a):
> > --- In "janne.kario" <janne.kario@>
wrote:
> >> --- In Daniel Smolik <marvin@> wrote:
> >>
> >>> I don't know if here is some driver to SD interface on TS
product
> >> for it.
> >>
> >> This might be a long shot. Random google search...
> >>
> >> http://dev.ivanov.eu/projects/cs-e9302/
> >
> > Sorry, wrong device. Somehow managed to misread the subject and
though
> > that we were talking about the TS-7260.
>
> Ok but I am interested to 7260,7400 too. But I mean that on this
board is no standard SD controller.
> All uses FPGA to access SD.
>
> Dan
>
I would love to see a community developed SD card driver using the
TS FPGA, but I lack the skills to contribute. Anyone _with_ the
skills should read the thread archived here:
http://tech.groups.yahoo.com/group/ts-7000/message/5998
The thread has a lot of the details and reasons for TS using a FPGA
rather than a standard SDHCI interface as published by the SD card
association [1].
IMHO, the difficulty of using TS binary SD module, and the risk of
future compatibility problems, could keep TS from more design wins.
Keeping a closed source kernel module up to date is a _lot_ of work;
just look at what nvidia and vmware go through when internal kernel
APIs change. Many folks just avoid the problem by avoiding HW that
requires closed source modules.
One of the reasons Jesse Off cited was the small size of the TS
implementation [2]:
TS created an SD host controller core in Verilog that only uses 200
LUTs on a CPLD and 4 8bit registers. This is very small compared to
companies selling standard SD logic cores. Existing soft cores on
the market require much larger and expensive FPGAs.
Well, doesn't the TS-7800 _have_ a big expensive FPGA? Perhaps a
SDHCI compliant core could be developed in the FPGA, and driven with
a standard SHDCI compliant kernel driver. (That wouldn't help the
TS-7400 folks though). And of course I have no idea of the
complexity involved ....
Regards, ....... Charlie
[1] http://www.sdcard.org/about/host_controller/simple_spec/
[2] http://tech.groups.yahoo.com/group/ts-7000/message/6055
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