Re: Linux-2.1.129 boot on MCP750

I have posted patches to this group that fix all these problems.
You can search the lists for them.

Alois Fertl [off-list ref] writes:

If you manage to put your zImage onto a prep partition
of a hard drive or if you boot it from floppy it should
work fine.

There is a problem in boot/misc.c which manifests only
if netboot is used. Current ppcbug netboots at 0x5000 and
this forces decompress to overwrite its own source.

You can fool netboot resp. boot/misc.c if you netboot
zImage.initrd ( make zImage.initrd which requires ramdisk.image.gz
in arch/ppc/boot; somewhere on the R4 CD ) and type
   noinitrd
to the Linux/PPC load: prompt.

I found some other improvement over the weekend which help using
linuxppc with serial console only. Due to limited time I was not
able to propagate them yet. I promise to do so over the next days.

Regards
  Alois



On Fri, 20 Nov 1998 18:25:08 +0100 (CET) VALETTE Eric 
[off-list ref] wrote:

quoted

I have sucessfully compiled the brand new linux-2.1.129 source tree
without any glich. I used the PREP configuration, made the zImage and tried
to boot it using motorola ppcbug firmware.

I first discovered that I add to replace all putc, puts routine because
I use the serial line (not a big deal). Then I added a more general code
than puthex in order to print also decimal and fixed some output in 
arch/ppc/boot to get inflate errors.

Here is what I get now : It shows that inflate fails.

-----------------------------------------------------------
Local Memory Found =02000000 (&33554432)

MPU Clock Speed =233Mhz

BUS Clock Speed =67Mhz

WARNING: Keyboard Not Connected

Reset Vector Location  : ROM Bank B
Mezzanine Configuration: Single-MPU
Current 60X-Bus Master : MPU0
Idle MPU(s)            : NONE

System Memory: 32MB, ECC Enabled (ECC-Memory Detected)
L2Cache:       1024KB, 117Mhz

PPC1-Bug>nbo
Network Booting from: DEC21140, Controller 0, Device 0
Device Name: /pci@80000000/pci1011,9@e,0:0,0
Loading: /zImage

Client IP Address      = 194.2.81.157
Server IP Address      = 194.2.81.241
Gateway IP Address     = 194.2.81.254
Subnet IP Address Mask = 255.255.255.0
Boot File Name         = /zImage
Argument File Name     = 

Network Boot File load in progress... To abort hit <BREAK>

Bytes Received =&794942, Bytes Loaded =&794942
Bytes/Second   =&397471, Elapsed Time =2 Second(s)

Residual-Data Located at: $01F78000
loaded at:     5400 19FC0

relocated to:  600000 614BC0

board data at: 1F78000 1F7EA0C

relocated to:  60E0B4 614AC0

zimage at:     E400 C539E

avail ram:     400000 600000



Linux/PPC load: 

Uncompressing Linux...descompressing to : 0 400000inflate returned-3  <============
exit

---------------------------------------------------------------------------

Reading the Makefile and trying to figure out how the binary image was 
done, I discovered that the compressed image is set in the file at the
same offset than the .bss and that there is in head.S a bzero of the
bss section As shown by the following header dump.


----------------------------------------------------------------------------
objdump -h zvmlinux

zvmlinux:     file format elf32-powerpc

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00005950  00600000  00600000  00010000  2**2
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
  1 .rodata       00001560  00605950  00605950  00015950  2**4
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  2 .data         00001b2c  00607000  00607000  00017000  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  3 .bss          0000bbc0  00609000  00609000  00019000  2**2
                  ALLOC
  4 image         000b6f9f  00000000  00000000  00019000  2**0
                  CONTENTS, READONLY
---------------------------------------------------------------------------

So I propose the following : 

Make mkprep know a little bit more about ELF and make a different binary image
with bss already zeroed and image moved from bss size. Do you know if libelf
package works on Linux PPC as It does on Linux Intel?

1) Is the analysis correct?
2) Do you want the small modif for printing decimal and the code that
prints correctly errors in gunzip routine?




-- 
   __                 
  /  `                   	Eric Valette
 /--   __  o _.          	Canon CRF
(___, / (_(_(__         	Rue de la touche lambert
				35517 Cesson-Sevigne  Cedex
				FRANCE
Tel: +33 (0)2 99 87 68 91	Fax: +33 (0)2 99 84 11 30
E-mail: valette@crf.canon.fr

-- 
Corey Minyard               Internet:  minyard@acm.org
  Work: minyard@nortel.ca       UUCP:  minyard@wf-rch.cirr.com

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