2.6.34 hangs during boot on PB11MPCore

[Shilimkar, Santosh]

> -----Original Message-----
> From: linux-arm-kernel-bounces at lists.infradead.org [mailto:linux-arm-kernel-
> bounces at lists.infradead.org] On Behalf Of Bjoern Brandenburg
> Sent: Monday, May 31, 2010 6:46 AM
> To: Catalin Marinas
> Cc: bastoni at cs.unc.edu; Daniel Mack; linux-arm-kernel at lists.infradead.org; linus.ml.walleij at gmail.com
> Subject: Re: 2.6.34 hangs during boot on PB11MPCore
> 
> On Sun, May 30, 2010 at 9:04 PM, Bjoern Brandenburg <bbb.lst at gmail.com> wrote:
> > On Sun, May 30, 2010 at 6:46 PM, Catalin Marinas
> > <catalin.marinas at arm.com> wrote:
> >> On Sun, 2010-05-30 at 22:38 +0100, Bjoern Brandenburg wrote:
> >>> On Sun, May 30, 2010 at 5:05 PM, Bjoern Brandenburg <bbb.lst at gmail.com> wrote:
> >>> > On Sun, May 30, 2010 at 3:27 PM, Bjoern Brandenburg <bbb.lst at gmail.com> wrote:
> >>> >>
> >>> >> I'll try to see if I can pinpoint what was dropped between 2.6.33-arm1
> >>> >> and 2.6.34-arm.
> >>> >
> >>> > Progress: I can get 2.6.34-arm to boot with all 4 CPUs after
> >>> > cherry-picking the following commits (which seemed relevant but
> >>> > absent):
> >>> >
> >>> > 60060ca ARM: Handle instruction cache maintenance fault  properly
> >>> > 3f64e83 ARM errata: Eviction Buffer not empty after Cache Sync on L220
> >>> > 3b009b5 ARM: change definition of cpu_relax() for ARM11MPCore
> >>> >
> >>> > Let's see which is the critical one...
> >>>
> >>> It's 3f64e83 "ARM errata: Eviction Buffer not empty after Cache Sync
> >>> on L220" [1]. With this commit cherry-picked (on top of the 'rebased'
> >>> branch in ARM's repository, i.e., 2.6.34-arm), the system boots to X11
> >>> and runs some simple FS tests; the other ones don't make a difference.
> >>>
> >>> Are there plans for getting this and the other patches in the
> >>> 'rebased' branch into mainline (for .35 or .36)?
> >>
> >> Thanks for the investigation. I recall I got something similar in the
> >> past though I could no longer reproduce it with 2.6.34 (-arm) on the
> >> PB11MPCore I have. Could you try reverting commit e7c5650f606 (ARM:
> >> Change the mandatory barriers implementation) on a vanilla 2.6.34
> >> kernel?
> >
> > That doesn't seem to help. v2.6.34 with e7c5650f606 reverted still hangs.
> 
> Given that 2.6.34-arm contains patches for missing synchronization
> primitives in the network driver, it is maybe not too surprising that
> the vanilla kernel won't boot with an NFS root file system.
> 
> I just tried 2.6.34-arm (i.e., the 'rebased' branch in the ARM repo)
> with e7c5650f606 reverted (and without cherry-picking 3f64e83)   and
> that kernel boots ok!
> 
We have similar observation on SPI based network driver. By playing with
buffer alignment, the issue seems to be going away. Do you have link
to " synchronization primitives in the network driver"  patches ??

Regards,
Santosh