Re: Deprecate the ppc405 boards in QEMU? (was: [PATCH v3 4/7] MAINTAINERS: Orphan obscure ppc platforms)

[Cédric Le Goater]

Hello Christophe,

On 10/27/21 12:42, Christophe Leroy wrote:
> Hi Cédric,
>
> Le 27/10/2021 à 10:40, Cédric Le Goater a écrit :
> > > > > I am raising this because the nanoMIPS support is in deprecated state
> > > > > since more than 2 releases, but it is still in-tree and I try to keep
> > > > > it functional. However, since no toolchain reached mainstream GCC/LLVM
> > > > > it is not easy to maintain. By keeping it in that state we give some
> > > > > time to other communities to have their toolchain upstreamed / merged.
> > > >
> > > > If you're trying to keep it functional and aren't going to remove
> > > > it, then it shouldn't be marked deprecated.
> > >
> > > OK, I'll move it back to Odd-fixes.
> >
> > The ppc405 boards are still in pretty bad shape. We need a patched u-boot,
> > a patched QEMU and a patched Linux and still, we do not reach user space
> > without some sort of crash.
>
> I guess Philippe was talking about the nanoMIPS here.
>
> By the way, ppc405 is not on an optimal shape yet for sure, but we are getting 
> better and better, and I'm aiming at getting it back to work, just because I 
> need it.
>
> By the way, were you able to re-test with CONFIG_MATH_EMULATION enabled after 
> your last oops report which shows that you're trying to execute floating points 
> instruction ?

That's the best I got :( Please send me your .config.

Thanks,

C.

=> bootm 0x1000000
## Booting kernel from Legacy Image at 01000000 ...
   Image Name:   Linux-5.15.0-rc7-dirty
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    3273457 Bytes = 3.1 MiB
   Load Address: 00700000
   Entry Point:  00701ad0
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
Memory <- <0x0 0x8000000> (128MB)
CPU clock-frequency <- 0x7f28155 (133MHz)
CPU timebase-frequency <- 0x7f28155 (133MHz)
/plb: clock-frequency <- 1fca055 (33MHz)
/plb/opb: clock-frequency <- 1fca055 (33MHz)
/plb/ebc: clock-frequency <- 1fca055 (33MHz)
/plb/opb/serial@ef600300: clock-frequency <- 1d1079 (2MHz)
/plb/opb/serial@ef600400: clock-frequency <- 1d1079 (2MHz)
ethernet0: local-mac-address <- 00:00:00:00:00:00
ethernet1: local-mac-address <- 00:00:2d:e5:44:80
Fixing devtree for 4M Flash

zImage starting: loaded at 0x00700000 (sp: 0x07eaabb0)
Decompression error: 'Not a gzip file'
No valid compressed data found, assume uncompressed data
Allocating 0x6bd274 bytes for kernel...
0x69a114 bytes of uncompressed data copied

Linux/PowerPC load:
Finalizing device tree... flat tree at 0xdc1960
Linux version 5.15.0-rc7-dirty (legoater@yukon) (powerpc64-linux-gnu-gcc (GCC) 
11.2.1 20210728 (Red Hat Cross 11.2.1-1), GNU ld version 2.35.2-1.fc34) #14 Wed 
Oct 27 18:41:41 CEST 2021
Using PowerPC 40x Platform machine description
printk: bootconsole [udbg0] enabled
-----------------------------------------------------
phys_mem_size     = 0x8000000
dcache_bsize      = 0x20
icache_bsize      = 0x20
cpu_features      = 0x0000000000000100
  possible        = 0x0000000000000100
  always          = 0x0000000000000100
cpu_user_features = 0x86000000 0x00000000
mmu_features      = 0x00000004
-----------------------------------------------------
Zone ranges:
  Normal   [mem 0x0000000000000000-0x0000000007ffffff]
Movable zone start for each node
Early memory node ranges
  node   0: [mem 0x0000000000000000-0x0000000007ffffff]
Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
MMU: Allocated 1088 bytes of context maps for 255 contexts
Built 1 zonelists, mobility grouping on.  Total pages: 32512
Kernel command line:
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes, linear)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes, linear)
mem auto-init: stack:off, heap alloc:off, heap free:off
Kernel virtual memory layout:
  * 0xffbdf000..0xfffff000  : fixmap
  * 0xc9000000..0xffbdf000  : vmalloc & ioremap
Memory: 122964K/131072K available (4920K kernel code, 224K rwdata, 1304K 
rodata, 316K init, 136K bss, 8108K reserved, 0K cma-reserved)
SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
NR_IRQS: 512, nr_irqs: 512, preallocated irqs: 16
UIC0 (32 IRQ sources) at DCR 0xc0
random: get_random_u32 called from start_kernel+0x498/0x5f8 with crng_init=0
clocksource: timebase: mask: 0xffffffffffffffff max_cycles: 0x1ec031343f, 
max_idle_ns: 440795203544 ns
clocksource: timebase mult[7800000] shift[24] registered
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 
7645041785100000 ns
futex hash table entries: 256 (order: -1, 3072 bytes, linear)
NET: Registered PF_NETLINK/PF_ROUTE protocol family
DMA: preallocated 128 KiB GFP_KERNEL pool for atomic allocations
             
thermal_sys: Registered thermal governor 'step_wise'
PCI host bridge /plb/pci@ec000000 (primary) ranges:
 MEM 0x0000000080000000..0x000000009fffffff -> 0x0000000080000000
  IO 0x00000000e8000000..0x00000000e800ffff -> 0x0000000000000000
4xx PCI DMA offset set to 0x00000000
4xx PCI DMA window base to 0x0000000000000000
DMA window size 0x0000000080000000
PCI: Probing PCI hardware
PCI host bridge to bus 0008:00
pci_bus 0008:00: root bus resource [io  0x0000-0xffff]
pci_bus 0008:00: root bus resource [mem 0x80000000-0x9fffffff]
pci_bus 0008:00: root bus resource [bus 00-ff]
pci_bus 0008:00: busn_res: [bus 00-ff] end is updated to ff
pci_bus 0008:00: busn_res: [bus 00-ff] end is updated to 00
pci_bus 0008:00: resource 4 [io  0x0000-0xffff]
pci_bus 0008:00: resource 5 [mem 0x80000000-0x9fffffff]
vgaarb: loaded
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti 
<giometti@linux.it>
PTP clock support registered
clocksource: Switched to clocksource timebase
NET: Registered PF_INET protocol family
IP idents hash table entries: 2048 (order: 2, 16384 bytes, linear)
tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes, linear)
TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes, linear)
TCP: Hash tables configured (established 1024 bind 1024)
UDP hash table entries: 256 (order: 0, 4096 bytes, linear)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes, linear)
NET: Registered PF_UNIX/PF_LOCAL protocol family
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
PCI: CLS 0 bytes, default 32
Mem-Info:
active_anon:0 inactive_anon:0 isolated_anon:0
 active_file:0 inactive_file:0 isolated_file:0
 unevictable:0 dirty:0 writeback:0
 slab_reclaimable:11 slab_unreclaimable:171
 mapped:0 shmem:0 pagetables:0 bounce:0
 kernel_misc_reclaimable:0
 free:30452 free_pcp:19 free_cma:0
Node 0 active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB 
unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:0kB dirty:0kB 
writeback:0kB shmem:0kB writeback_tmp:0kB kernel_stack:152kB pagetables:0kB 
all_unreclaimable? no
Normal free:121808kB min:1400kB low:1748kB high:2096kB reserved_highatomic:0KB 
active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB 
unevictable:0kB writepending:0kB present:131072kB managed:122964kB mlocked:0kB 
bounce:0kB free_pcp:76kB local_pcp:76kB free_cma:0kB
lowmem_reserve[]: 0 0
Normal: 4*4kB (UM) 2*8kB (ME) 3*16kB (UM) 2*32kB (UM) 3*64kB (ME) 3*128kB (UME) 
5*256kB (UME) 4*512kB (UME) 3*1024kB (ME) 4*2048kB (UME) 26*4096kB (M) = 
121808kB
0 total pagecache pages
0 pages in swap cache
Swap cache stats: add 0, delete 0, find 0/0
Free swap  = 0kB
Total swap = 0kB
32768 pages RAM
0 pages HighMem/MovableOnly
2027 pages reserved
Kernel panic - not syncing:
CPU: 0 PID: 5 Comm: kworker/u2:0 Not tainted 5.15.0-rc7-dirty #12
Workqueue: events_unbound async_run_entry_fn
Call Trace:
[c0845d70] [c0026a40] panic+0x11c/0x2e0 (unreliable)
[c0845dd0] [c000513c] sys_mmap2+0x0/0x20
[c0845e20] [c0617844] do_populate_rootfs+0x48/0x17c
[c0845e60] [c004a8ec] async_run_entry_fn+0x34/0xc4
[c0845e80] [c003f6c0] process_one_work+0x268/0x3e0
[c0845eb0] [c003fd40] worker_thread+0x17c/0x4c4
[c0845f00] [c0047898] kthread+0x12c/0x14c
[c0845f40] [c0010114] ret_from_kernel_thread+0x14/0x1c
Rebooting in 180 seconds..