Sandpoint/PPMC750 MPPMC7400

Sandpoint/PPMC750 MPPMC7400

[Zhaobin Zhu]

Hi,

I has been trying to boot Hardhat (CDK1.2)linux kernel on
Sandpoint/PPMC750. Everytime the boot gets stuck at
.......
>Uncompressing Linux...done.
>Now booting the kernel

I replaced the PPMC750 with an PPMC7400 and boot the same code,
the boot went all the way through until

.....
>Kernel panic: I have no root and I want to scream
>Rebooting in 180 seconds..

Does anybody know where the kernel could possibly be hanging (for PPMC750) ?

Also what COP-based debug tools are available for PPMC750/7400 on sandpoint.
Somebody mentioned Arbitron and EST.
Did anybody have experience with them and what you recommend ?

Thanks,

--
 Zhaobin Zhu
 zzhu@emc.com


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

RE: Sandpoint/PPMC750 MPPMC7400

[ZHANG,HAI-TAO (Non-A-China,ex1)]

Hi,

> -----Original Message-----
> From: Zhaobin Zhu [mailto:zzhu@emc.com]
> Sent: Friday, September 22, 2000 11:47 PM
> Cc: linuxppc-embedded@lists.linuxppc.org
> Subject: Sandpoint/PPMC750 MPPMC7400
> Hi,
>
> I has been trying to boot Hardhat (CDK1.2)linux kernel on
> Sandpoint/PPMC750. Everytime the boot gets stuck at
> .......
> >Uncompressing Linux...done.
> >Now booting the kernel
Do you use 2.3.16 kernel ? The kernel stops here may be caused by MMU_init,
please check the arch/ppc/kernel/head.S and arch/ppc/mm/init.c. (you can use
ppc_md.progress for printing messages)

>
> Also what COP-based debug tools are available for
> PPMC750/7400 on sandpoint.
> Somebody mentioned Arbitron and EST.
> Did anybody have experience with them and what you recommend ?
Here we have Arbitiron BDI2000, it is a little bit helpful but I think that
reading the kernel source is the most useful way, or you can try xmon.

Thanks,
Haitao Zhang

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: Sandpoint/PPMC750 MPPMC7400

[Zhaobin Zhu]

"ZHANG,HAI-TAO (Non-A-China,ex1)" wrote:

> > I has been trying to boot Hardhat (CDK1.2)linux kernel on
> > Sandpoint/PPMC750. Everytime the boot gets stuck at
> > .......
> > >Uncompressing Linux...done.
> > >Now booting the kernel
> Do you use 2.3.16 kernel ? The kernel stops here may be caused by MMU_init,
> please check the arch/ppc/kernel/head.S and arch/ppc/mm/init.c. (you can use
> ppc_md.progress for printing messages)
>

Hi  HAI-TAO,

The kernel I use is Linux version 2.4.0-test2 .

I enabled Sandpoint_debug. Here is the __most farther__ the boot goes:
-----
DINK32_ARTHUR >>go 900000
loaded at:     00900000 00914E20
relocated to:  00800000 00814E20
zimage at:     0090B000 00989621
avail ram:     00400000 00800000

Linux/PPC load: root=nfs
Uncompressing Linux...done.
Now booting the kernel
id mach(): doneMMU:enterMMU:hash inithash:enterhash:find
piecehash:patchhash:doneMMU:mapinMMU:setbatMMU:exitsetup_arch
: entersetup_arch: bootmemarch: exit
------
Observed problems:
1) The boot is no consistent.
     Sometime it hangs at
     Now booting the kernel
     id mach():

     Sometime it hangs at
     Now booting the kernel
     id mach(): doneMMU:enterMMU:hash inithash:enterhash:find piece

2) By luck, the most farther it reaches
     Now booting the kernel
     id mach(): doneMMU:enterMMU:hash inithash:enterhash:find
     piecehash:patchhash:doneMMU:mapinMMU:setbatMMU:exitsetup_arch
     : entersetup_arch: bootmemarch: exit

     It hangs there after entering free_area_init().

     I can't find the rountine under /arch/ppc/. So it must be an arch
independent
     rountine.

     Is it defined in mm/page_alloc.c:void __init free_area_init(unsigned long
*zones_size) ?

>From what I described, does anybody have a hint on what the problem is with
PPMC750 ?

The boot goes fine with PPMC7400 on Sandpoint.

Thanks,

--
 Zhaobin Zhu
 zzhu@emc.com 508-435-1000 x12823
 Hardware Engineering, EMC Corporation


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/