I have tracked my 'lockup' to a specific line in /powerpc/kernel/prom.c In the function: __init unflatten_device_tree(void) On line:
mem = lab_alloc(size + 4, __alignof__(struct device_node)); mem = (unsigned long) __va(mem); ((u32 *)mem[size / 4] = 0xdeadbeef; This is causing a lockup when 0xdeadbeef is written. I have no idea why... My assumption would be that somehow the memory is not ready? Or BATS are not setup correctly? Perhaps a LAW register? Is this line dependent on having the DTS tree setup correctly? If so, how big can the 'memory' node be in the DTS file? I have mine tried a single bank of 256MB, and of 512MB <I have a single 512MB DIMM at the moment> -Russ ---------------------------------------------------------------------- Original Message: All, Trying to boot up / debug my board with a Rev 1.2 MPC8360E. After the kernel launches from U-boot I receive no serial debug, and the system hangs. I am running U-boot 1.1.6. Dirty <which does contains support for the 8360>, I have walked through the DTS/blob file, after U-boot modifies it, <I turned on all the debug info>, and can clearly see that the /chosen node, etc.. is getting entered. My original DTS file already has all of the clock speeds entered <modeled after the MPC8360xx.dts file that was already in the DENX-2.6.19.2 kernel release>. I have limited debug ability via some GPIO leds on our board, I can see that the kernel starts to run and at least gets to the point where it clears all the BATs <powerpc/boot/head_32.S and setup_32.c>, at which point I lose access to the IO space and can no longer write out to the debug lights. Unfortunately I do not have access to a COP debugger at this point. It doesn't seem to get to the platform files, or at least I can get the GPIO access inside the IMMR space to work correctly. Does anyone have any suggestion per software only debug method that might be enabled? Or a way to temporarily hack the early serial output so I can see what is going on? -Russ _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
