Subject: [Bug 203125] Kernel 5.1-rc1 fails to boot on a PowerMac G4 3,6: Caused by (from SRR1=141020): Transfer error ack signal

From: [email-masked]
Date: Thu, 09 May 2019 10:50:43 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=203125

--- Comment #7 from Christophe Leroy ([email-masked]) ---
On 05/09/2019 10:05 AM, [email-masked] wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=203125
> 
> Christophe Leroy ([email-masked]) changed:
> 
>             What    |Removed                     |Added
> ----------------------------------------------------------------------------
>                   CC|                            [email-masked]
> 
> --- Comment #5 from Christophe Leroy ([email-masked]) ---
> Apparently, MSR DR is not sent and DAR has value 0xc0090654, meaning that a
> virt address tries to get accessed while in real mode.
> 

Could you try the patch below:

diff --git a/arch/powerpc/mm/book3s32/hash_low.S 
b/arch/powerpc/mm/book3s32/hash_low.S
index e27792d0b744..8366c2abeafc 100644
--- a/arch/powerpc/mm/book3s32/hash_low.S
+++ b/arch/powerpc/mm/book3s32/hash_low.S
@@ -539,7 +539,8 @@ _GLOBAL(flush_hash_pages)
  #ifdef CONFIG_SMP
        lis     r9, (mmu_hash_lock - PAGE_OFFSET)@ha
        addi    r9, r9, (mmu_hash_lock - PAGE_OFFSET)@l
-       lwz     r8,TASK_CPU(r2)
+       tophys  (r8, r2)
+       lwz     r8, TASK_CPU(r8)
        oris    r8,r8,9
  10:   lwarx   r0,0,r9
        cmpi    0,r0,0

Christophe

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