I am working through bringing up Linux 2.6.13.4 on a Xilinx V4 based ppc405.
with memory from 0x0 through 0x7fffffff
Right now I get:
>Starting MonitorX.elf: V3.3.2.0.
>
>loaded at: 00400000 0047F13C
>board data at: 0047D128 0047D13C
>relocated to: 00405300 00405314
>zimage at: 00405A95 0047CE71
>avail ram: 00480000 08000000
>
>Linux/PPC load: console=ttyS0,9600 console=tty0 init=/linuxrc
looptype=squashfs cdroot splash=silentttttt
>Uncompressing Linux......done.
>Now booting the kernel
I have been able to trace execution into head_4xx.S to immediately
before turn_on_mmu:
But immediately after this I lose the ability to trace.
I have been tracing things with a status port at 0x70000000 I can write
to and read from the host side with code like
lis r14,0x7000 /* debugging port */
li r15,0x2305 /* value to output */
stw r15,4(r14)
eieio
after turn_on_mmu executes this does not seem to work.
looking at other code it appeared that I needed to add
tophy(r14,r14) prior to the stw
but that does not seem to help.
What do I need to do to be able to continue to use my debug port ?
