[U-Boot-Users] Problem with SystemACE cmd_ace.c patch of 7 Aug 2005

Stephen Williams steve at icarus.com
Thu Apr 6 20:07:37 CEST 2006

Hash: SHA1

Jeff Angielski wrote:
> On Wed, 2006-04-05 at 19:04 -0700, Stephen Williams wrote:
>> I have a problem with some changes you (Jeff) did in u-boot related
>> to compact flash. Can you help me understand why you put this:
>> +           /* Reset the configruation controller */
>> +           val = ace_readw(0x18);
>> +           val|=0x0080;
>> +           ace_writew(val, 0x18);
>> +
> This is directly from the the Xilinx SystemACE Manual, "Reading Sector
> Data from Compact Flash Control Flow Porcess".  In my manual the flow
> diagram is Figure 23. 

Sure 'nuff, I see it there. Ugh!

So then that begs the question, why am I getting this:

>>  JTAG controller couldn't read configuration from the CompactFlash

interrupting (and killing) my Linux boot? When I take that code
back out, the spurious error interrupt does not happen. Do you
use the SystemACE in your Linux environment after/during boot?

On my side, I'll press the issue with Xilinx and see what they
have to say.

BTW, the Linux SystemACE driver that is apparently written by
Xilinx does not go through this reset cycle in its block read.
- --
Steve Williams                "The woods are lovely, dark and deep.
steve at icarus.com           But I have promises to keep,
http://www.icarus.com         and lines to code before I sleep,
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