[U-Boot-Users] BDI2000 and MPC8260

[Alex Zeffertt]

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