Ok, my initial finding (that it was hanging after
do_init_bootmem) was incorrect.  I enabled the early
serial debug interface in the kernel, and it is
failing when initializing the PCI busses.  So I tried
typing "pci 0" in U-Boot, and I get
"pci_bus_to_hose(): failed" for busses 1 and 2 (0
returns fine).  If I comment out the board's pci_init
function, the kernel will boot every time, though it
crashes when it tries to probe the pci busses (as
expected).  So it seems to be an issue in my U-Boot
configuration or bootstrap settings.

Thanks for the help though!

--- Muruga Ganapathy <gmuruga@gdatech.com> wrote:

I would like to suggest to check the (quality of)
clocks to memory
under  

a. normal condition ( before loading the linux)
b. during the linux booting

Usually the clock needs to be buffered if it needs
to drive
more memory chips ( banks).

Another suggestion is to increase the cas latency to
a higher 
value in the memory controller. ( say from 2 to 2.5
or to a higher
values.

Also there are configuration registers to introduce
wait states to 
memory read and write cycles. So you may want to
introduce more wait 
states by programming the memory controller
register.

Thanks
G.Muruganandam

quoted

I have been working with the hardware guys trying

to

quoted

find any issues with the memory, and we haven't

seen

quoted

anything yet, and we have talked to AMCC, and they
said  they couldn't see anything wrong with the
hardware.  I did do a post-mordum dump of the log
buffer, and this is what I get:

001e40c4: 3c353e4c 696e7578 20766572 73696f6e   
<5>Linux version
001e40d4: 20322e36 2e313520 28726f6f 74406c6f    
2.6.15 (root@lo
001e40e4: 63616c68 6f73742e 6c6f6361 6c646f6d   
calhost.localdom
001e40f4: 61696e29 20286763 63207665 7273696f   

ain)

quoted

(gcc versio
001e4104: 6e20342e 302e3020 2844454e 5820454c    n
4.0.0 (DENX EL
001e4114: 444b2034 2e302034 2e302e30 29292023   

DK

quoted

4.0 4.0.0)) #
001e4124: 38205475 65205365 70203236 2031373a    8

Tue

quoted

Sep 26 17:
001e4134: 34393a31 33204544 54203230 30360a3c   

49:13

quoted

EDT 2006.<
001e4144: 343e4a4a 533a2057 41532048 4552454a   
4>JJS: WAS HEREJ
001e4154: 4a53324a 4a53334a 4a53335f 314a4a53   
JS2JJS3JJS3_1JJS
001e4164: 345f4a4a 53345f31 5f4a4a53 345f325f   
4_JJS4_1_JJS4_2_
001e4174: 4a4a5334 5f335f4a 4a53345f 00000000   
JJS4_3_JJS4_....
001e4184: 00000000 00000000    ........

I placed a few printks in arch/ppc/kernel/start.c

and

quoted

found that it crashed right after

do_init_bootmem(),

quoted

right after placing the first character of

"_JJS4_1".

quoted

        printk("JJS3");
        parse_early_param();
        printk("JJS3_1");
        for (i = 0; i < 1000000; i++)
        {
                if (i > 999999)
                {
                        break;
                }
        }

        printk("JJS4");
        /* set up the bootmem stuff with available
memory */
        do_init_bootmem();
        printk("_JJS4_1");
        if ( ppc_md.progress )
ppc_md.progress("setup_arch: bootmem", 0x3eab);
        printk("_JJS4_2");


When it does decide to work, most of the time it

gets

quoted

through the whole kernel and everything runs fine,
though I have seen it hang after probing for PCI
devices a couple of times.  This looks like it is

a

quoted

memory issue, but I don't know what else to try. 

Does

quoted

anyone have any ideas?  I would appreciate any

input.

quoted

Thanks,
   Jeff Stevens 


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