Re: Problem booting linux-2.4.4-2001-07-23 on EST SBC8260 with ppcboot 1.0.4

You should have ppcboot remap the IMMR to 0xF0000000 in the start of ppcboot
code. Otherwise it will interfere with Linux memory mapping. See this file for
all the info you need.

http://www.linuxhq.com/kernel/v2.4/doc/powerpc/SBC8260_memory_mapping.txt.html

gl!

Kevin Fry


Craig MacDonald wrote:

I am trying to get linux 2.4 running on an EST SBC8260.
It seems others have this board working correctly, so
I must be doing something wrong.
It works up to executing the rfi in turn_on_mmu, but
it doesn't seem to reach start_here.

I have modified linux to use the correct bd_info structure
in ppcboot.h and the immr_base value. Below is some information
from ppcboot.

PPCBoot 1.0.4 (Aug 12 2001 - 07:16:41)

MPC8260 Reset Status: External Soft

MPC8260 Clock Configuration
 - Bus-to-Core Mult 4x, VCO Div 2, 60x Bus Freq  25-75 , Core Freq 100-300
 - dfbrg 0, corecnf 0x0a, busdf 3, cpmdf 1, plldf 0, pllmf 1
 - vco_out  132000000, cpm_clk   66000000, bus_clk   33000000
 - scc_clk   33000000, brg_clk   33000000, cpu_clk  132000000

CPU:   MPC8260 (Rev 01, Mask A.1 1K22A-XC) at 132 MHz
Board: EST SBC8260
DRAM:  32 MB
FLASH:  4 MB
BEDBUG Ready
In:    serial
Out:   serial
Err:   serial

bdinfo
------------------------
memstart    = 0x00000000
memsize     = 0x02000000
flashstart  = 0xfff00000
flashsize   = 0x00400000
flashoffset = 0x00040000
sramstart   = 0x00000000
sramsize    = 0x00000000
immr_base   = 0x0f000000
bootflags   = 0x00000001
intfreq     =    132 MHz
busfreq     =     33 MHz
ethaddr     = 00:02:6A:00:00:55
  IP addr     = 10.0.0.62
  baudrate    =  19200 bps
getc        = 0x01fd0ec8
tstc        = 0x01fd0ef8
putc        = 0x01fd0e18
puts        = 0x01fd0e84
printf      = 0x01fcd57c
install_hdlr= 0x01fd1a74
free_hdlr   = 0x01fd1b14
malloc      = 0x01fcbfe4

TFTP from server 10.0.0.12; our IP address is 10.0.0.62
Filename 'linux'.
Load address: 0x100000
Loading: /
done
Bytes transferred = 458355 (6fe73 hex)
free        = 0x01fcc4d8
## Booting image at 00100000 ...
   Image Name:   linux 2.4
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    458291 Bytes = 447 kB = 0 MB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK

Thanks,
Craig MacDonald

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