On Thursday 04 November 2004 20:56, Devraj Mukherjee wrote:
Hi everyone,
We finally got U-Boot up and running on our board. Many thanks to everyone who replied to our emails. We are having trouble writing the initial environment variables to the system.
This sounds like it may be a problem with the newer board revisions vs. the current cvs. There were changes to the cpld and the I/O buffers which set the buffers in the wrong direction by default at boot. You have to either enable pcmcia (both) or set a couple gpio lines.
To check your cpld revision enter the following:
LPD7A400> md.b 0x71400000 1
The only info I have is from the boards I've been able to get. A cpld revision >= 0x34 has the buffer change. I've seen lower version numbers mentined as have this change also but cannot confirm.
To set the gpio pins enter the following:
LPD7A400> mw 0x80000e3c 0x00000000 1 LPD7A400> mw 0x80000e38 0x00000005 1
The first command ensures portg pins are outputs (default). The second command sets the necessary pins to set the buffers in the proper direction.
I was holding off the patch for this till I got reliable info about the the card engine revision vs. the buffer direction change. I haven't gotten any response yet.
-- Paul Ruhland