Hi,
I try to port U-Boot 1.3.4 on a custom MPC8270 card. I'm very new to PowerPC and U-Boot, I'm therefore a little lost in the huge set of documentation and most likely have silly questions.
My board has the following main characteristics: - 128 MB SDRAM - 32 MB Flash (4xAM29LV641) mapped at 0xF4000000 - 3x MPC8270 cores (one master, 2 slaves) - 60x is used instead of local bus - PCI unused - RS232 on SMC2 - HWCW configured by a PLD and used since years
As a first step, I would like to have a serial console output, but I did not succeed yet:
I figured that it is not that far from PQ2FADS, therefore I took this configuration as my base.
1. I added CONFIG_API and DEBUG in my config
2. I figured from HWCW value that I needed lowboot, and have set TEXT_BASE to start address of u-boot in flash, 0xF4000000 (I have read again "System Initialization" but I'm not yet certain of this).
3. I defined CONFIG_CONS_ON_SMC, undefined CONFIG_CONS_ON_SCC and set CONFIG_CONS_INDEX to 2
4. CONFIG_8260_CLKIN is set to 100Mhz with PQ2FADS so I think and don't need to change that.
5. I flashed (with trace32 on Linux) u-boot.bin at 0xF4000000 (first flash address)
With the debugger, I can see that 0x100 is executed first and contains my u-boot code (li r21, 0x1). But it then crashes at first init_8260_core instructions. Of course, no data comes yet from the serial port.
Any help or documentation pointing would be greatly appreciated, so that I can finally see this famous U-Boot prompt ;)
Best regards, Rémi Lefevre