Hello again, just a quick update: I have spent some more time on this and now I can boot into kernel (it works even with initramfs and simple assembly HelloWorld, so it's time to compile userland now). The problem was that kernel must be at location 0. Another problem was that interrupts got re-enabled during execution of my bootloader (I am doing some syscalls -> goes to Cisco rom), otherwise it crashed randomly. And finally it seems that stack must be < 8M. After this kernel boots.
Anyway, I would still appreciate clarification on vmlinux:__start entry conditions: - must be loaded at 0 (but why arch/powerpc/boot/main.c has option to allocate space for kernel at nonzero addr ?) - stack? Does it really have to be < 8M ? - interrupts disabled (really ;-) ) - MSR.PR=0/LE=0/EE=0, but what other bits (RI? IP=0? ME?) - IMMR 0xff000000 - and of course correct entry arguments in registers anything else? I am also curious why CONFIG_PPC_EARLY_DEBUG_CPM uses CONFIG_PPC_EARLY_DEBUG_CPM_ADDR as pointer to transmit SMC buffer and not address of CPM/SCM parameter RAM ? TX buffer address can be read from SMC parameter RAM. Wouldn't this solution be more portable? At least this way I do it when I take over console from Cisco startup/rommon. Martin _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
