linux-kernel - Re: [PATCH v3 00/16] powerpc/32: Use BATs/LTLBs for STRICT_KERNEL

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Date:   Thu, 21 Feb 2019 12:47:26 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, j.neuschaefer@....net
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 00/16] powerpc/32: Use BATs/LTLBs for STRICT_KERNEL_RWX

Christophe Leroy <christophe.leroy@....fr> writes:

> The purpose of this serie is to:
> - use BATs with STRICT_KERNEL_RWX on book3s (See patch 13 for details.)
> - use LTLBs with STRICT_KERNEL_RWX on 8xx (See patch 15 for a few details.)

This doesn't boot qemu-mac99 for me:

  spawn ~/src/qemu/ppc-softmmu/qemu-system-ppc -nographic -vga none -M mac99 -m 1G -kernel build/vmlinux -initrd ppc32-initrd.gz -append console=ttyPZ0 init=/bin/sh
  >> =============================================================
  >> OpenBIOS 1.1 [Feb 15 2019 10:05]
  >> Configuration device id QEMU version 1 machine id 1
  >> CPUs: 1
  >> Memory: 1024M
  >> UUID: 00000000-0000-0000-0000-000000000000
  >> CPU type PowerPC,G4
  milliseconds isn't unique.
  Welcome to OpenBIOS v1.1 built on Feb 15 2019 10:05
  >> [ppc] Kernel already loaded (0x01000000 + 0x00c2c338) (initrd 0x01d2d000 + 0x007e72f0)
  >> [ppc] Kernel command line: console=ttyPZ0 init=/bin/sh
  >> switching to new context:
  OF stdout device is: /pci@...00000/mac-io@...scc@...00/ch-a@...20
  Preparing to boot Linux version 5.0.0-rc2-gcc-8.2.0-00125-g4fcb83ca7936 (michael@ka4) (gcc version 8.2.0 (Buildroot 2018.11-rc2-00003-ga0787e9)) #724 Thu Feb 21 12:03:14 AEDT 2019
  Detected machine type: 00000400
  command line: 
  memory layout at init:
    memory_limit : 00000000 (16 MB aligned)
    alloc_bottom : 02515000
    alloc_top    : 30000000
    alloc_top_hi : 40000000
    rmo_top      : 30000000
    ram_top      : 40000000
  copying OF device tree...
  Building dt strings...
  Building dt structure...
  Device tree strings 0x02516000 -> 0x025150a4
  Device tree struct  0x02517000 -> 0x3fde7eb0
  Quiescing Open Firmware ...
  Booting Linux via __start() @ 0x01000000 ...
  FAIL! Booting BE pmac32


That's pmac32 defconfig ish.
I haven't had time to debug it further sorry.

cheers