[U-Boot-Users] BDI2000 and MPC8260
Hi,
I hope this isn't considered off topic here....
I am trying to load u-boot.bin into the flash device on my PM828 board using a BDI2000 and the config file ftp://ftp.denx.de/pub/BDI2000/pm826.cfg. On the PM828 platform the HRW - hard reset configuration word- is loaded into the CPU from bottom of the flash device on CS0.
The problem I am seeing is that the bdi2000 cannot communicate with the PM828 if the HRW is not present in the flash device. I.e. you need u-boot.bin already loaded into flash in order to load u-boot.bin into flash!
At the moment I can work around this problem by setting some jumpers on the board to remap CS0 to a PROM device containing u-boot, writing the HRW into flash, and returning the jumpers so that CS0 is mapped to the flash again. Unfortunately I will not be able to do this on our custom hardware as there will only be a flash device and no PROM.
Here is the output from the BDI2000 session when the flash on CS0 is erased (i.e. the HRW is 0xffffffff):
- TARGET: waiting for target Vcc - TARGET: waiting for target Vcc - TARGET: waiting for target Vcc
[ PM828 is switched on ] - TARGET: processing power-up delay - TARGET: processing user reset request - BDI asserts HRESET - Reset JTAG controller passed - Bypass check: 0x00000001 => 0x00000001 - JTAG exists check passed - COP status is 0x01 - Check running state passed - BDI scans COP freeze command - BDI removes HRESET - Target PVR is 0x80822011 - COP status is 0x05 - Check stopped state passed - Check LSRL length passed - BDI sets breakpoint at 0xFFF00100 - BDI resumes program execution - Waiting for target stop passed - TARGET: Target PVR is 0x80822011 - TARGET: resetting target passed - TARGET: processing target startup .... - TARGET: processing target startup passed
[ 10 second gap ]
*** TARGET: reset detected, restarting target - BDI asserts HRESET - Reset JTAG controller passed - Bypass check: 0x00000001 => 0x00000001 - JTAG exists check passed - COP status is 0x05 - Check running state failed - TARGET: Target PVR is 0x80822011 *** TARGET: resetting target failed # PPC: unexpected response from target - TARGET: target will be restarted in 10 sec - TARGET: processing user reset request
[ the above repeats indefinitely ]
Does anybody have any idea how to work around this circular dependency?
Regards,
Alex
On Sep 1, 2005, at 6:43 AM, Alex Zeffertt wrote:
The problem I am seeing is that the bdi2000 cannot communicate with the PM828 if the HRW is not present in the flash device.
That doesn't sound quite right, but worst case all you need to do is pull RSTCONF to ground and the 82xx will use an internal configuration word to get you going.
Thanks.
-- Dan
On Thursday 01 September 2005 20:42, Dan Malek wrote:
On Sep 1, 2005, at 6:43 AM, Alex Zeffertt wrote:
The problem I am seeing is that the bdi2000 cannot communicate with the PM828 if the HRW is not present in the flash device.
That doesn't sound quite right, but worst case all you need to do is pull RSTCONF to ground and the 82xx will use an internal configuration word to get you going.
Thanks.
-- Dan
Yes, that's absolutely true.
If your boot flash is not written correctly, you'd better have a way to pull RSTCONF low. Different BDI settings are required however, beware.
Regards
Pantelis
participants (3)
-
Alex Zeffertt -
Dan Malek -
Pantelis Antoniou