On August 24, 2006 02:01 am, irares wrote:
> Has anybody tried something like attaching an spi SDCARD connector on
> ARM9 gpio pins and booting from it by bypassing the FPGA sdcard
> interface ?
>
I'm playing with that now. ( just starting ).
I'm using an earlier version of this SD interface card from SparkFun:
http://www.sparkfun.com/commerce/product_info.php?products_id=204
here is my setup:
http://www.rytis.com/curtis/IM000600.JPG
- the device directly below the TS-7250 is a BitScope Pocket analyzer, for
testing the SD signals. http://www.bitscope.com/product/BS50/
- the block under the serial connector is an RS232 mini-tester to see what the
serial connection is doing. http://www.scancat.com/minitstr.html
I soldered off the 2kB EEPROM and replaced it with an 8kB EEPROM, giving me an
additional 6kB. Then I updated my SerialBlaster program to handle the 8kB
EEPROM. I also updated the SerialBlaster Loader program to function as a
terminal after booting the TS-7250, so I don't need MINICOM.
Next I plan to load the remaining 6kB of EEPROM into memory as the second half
of the boot loader process. This 6kB second stage will boot the system from
SD.
I'm considering adding SD functions to RedBoot too.
> I attached an spi SDCARD connector to the gpio pins and I load the arm9
> on serial port. then I want the arm to be able to boot from my sdcard
> without initializing the fpga.
>
> I'm at a point where I'm able to read the first 512 block from the
> sdcard.
>
Do you have code you are willing to share?
> If you guys are aware of a simple architecture with arm9 + spi SDCARD
> which is able to completly boot linux from the SDCARD, I'll appreciate
> any help..
>
-Curtis.
>
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