PREP kernel for MCP750/MCPN750

Hi,

Quite a while back I decided to try and get the NetBSD PREP kernel 
running on some Motorola SBC's that I've got (MCP750 & MCPN750).  What 
I have boots and runs fine so far, but is really just an experimental 
hack.  This is not a real port at this stage and I likely will not get 
back to this for some time, so I figured I should at least make what I 
have available.

Asides from the less than clean changes I've made, there are obvious 
items not covered; e.g. the large bank of FLASH has not been mapped in. 
  Also, as I do not have transition modules for these cPCI boards, I 
have been doing everything over NFS (Boot, root, swap) and serial 
ports.

I'll include my patch file for the 1.6 source tree, but the real 
changes in this "hack" are:

1)  arch/prep/isa/mkclock_isa.c:  Exclude NVRAM size check as the clock 
device is slightly different and causes boot issues ("hack" remember).

2) arch/prep/prep/mainbus.c:  mainbus_attach(),  lengthened the pciio 
extent to 0x00027fff.

3) arch/prep/prep/platform.c: reset_unknown() now calls 
reset_prep_generic().

4) dev/pci/pciconf.c:  setup_iowins()  test pi->address against 
0xffffffff instead of -1 as there is some type issues here (likely a 
real bug, but I don't recall how far I tracked this down).

Other issues:  make sure that the MCP750 is in PREP boot mode (see 
PPCBUG manual).

I'm providing my patch file and the configuration file.  There's extra 
garbage in the patch file, but nothing exciting.  The configuration 
file is just a very pared down version of the GENERIC one.

As I know I will not get back to this for some time, if someone wants 
to start a proper port then I can likely provide an MCP750 cPCI board, 
but no chassis or backplane or transition module.  Also, if there is 
some real interest in this platform, then I could likely be encouraged 
to get back into it.

Cheers,
Michael Stevens

diff -r /mnt/sys/arch/prep/isa/mkclock_isa.c sys/arch/prep/isa/mkclock_isa.c
117c117
< 
---
> printf("+++ mkclock_isa_match: (1)\n"); /* ++++ PMS, debuggering ++++ */
122a123
> printf("+++ mkclock_isa_match: (2)\n"); /* ++++ PMS, debuggering ++++ */
126a128
> printf("+++ mkclock_isa_match: (3)\n"); /* ++++ PMS, debuggering ++++ */
130a133
> printf("+++ mkclock_isa_match: (4)\n"); /* ++++ PMS, debuggering ++++ */
134a138,140
> printf("+++ mkclock_isa_match: (5) %ld\n",res->VitalProductData.NvramSize
> ); /* ++++ PMS, debuggering ++++ */
> #if 0 /* ++++ PMS ,debuggering ++++ */
137c143,144
< 
---
> #endif
> printf("+++ mkclock_isa_match: (6)\n"); /* ++++ PMS, debuggering ++++ */
143a151
> printf("+++ mkclock_isa_match: (7)\n"); /* ++++ PMS, debuggering ++++ */
194a203
> printf("+++ mkclock_isa_match: (8)\n"); /* ++++ PMS, debuggering ++++ */
diff -r /mnt/sys/arch/prep/prep/mainbus.c sys/arch/prep/prep/mainbus.c
131a132
> #if 0	/* ++++ PMS, debuggering ++++ */
133a135,138
> #else
> 	ioext  = extent_create("pciio",  0x00008000, 0x00027fff, M_DEVBUF,
> 	    NULL, 0, EX_NOWAIT); 
> #endif
diff -r /mnt/sys/arch/prep/prep/platform.c sys/arch/prep/prep/platform.c
126a127,129
>     /* ++++ PMS, debuggering, all code added by moi ++++ */
>     /* asm ("addi 10,0,0x0063; sc");       Dropout to PPCBUG */
>     reset_prep_generic();
diff -r /mnt/sys/dev/pci/pciconf.c sys/dev/pci/pciconf.c
670a671
> #if 0 	/* ++++ PMS, debuggering ++++ */
671a673,675
> #else
> 		if (pi->address == 0xffffffff) {
> #endif