linux-kernel - 2.6.31 kernel built for sh4 doesn't boot under qemu-system-sh4.

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Message-Id: <200909201919.17990.rob@landley.net>
Date:	Sun, 20 Sep 2009 19:19:17 -0500
From:	Rob Landley <rob@...dley.net>
To:	kernel list <linux-kernel@...r.kernel.org>, qemu-devel@...gnu.org
Subject: 2.6.31 kernel built for sh4 doesn't boot under qemu-system-sh4.

The 2.6.30 kernel in the system image at
http://impactlinux.com/fwl/downloads/binaries/system-image-sh4.tar.bz2
boots to a shell prompt under a reasonably current qemu-git snapshot (sometime 
Tuesday I think).

Swapping in a 2.6.31 kernel, the boot gets as far as:

>long read to SH7750_WCR1_A7 (0x000000001f800008) ignored
>long read to SH7750_WCR2_A7 (0x000000001f80000c) ignored
>long read to SH7750_WCR3_A7 (0x000000001f800010) ignored
>long read to SH7750_MCR_A7 (0x000000001f800014) ignored
>long read to SH7750_MCR_A7 (0x000000001f800014) ignored
>Linux version 2.6.30-rc4 (landley@...ftwood) (gcc version 4.2.1) #1 Sun Sep
> 20 18:55:18 CDT 2009 Boot params:
>... MOUNT_ROOT_RDONLY - 00000000
>... RAMDISK_FLAGS     - 00000000
>... ORIG_ROOT_DEV     - 00000000
>... LOADER_TYPE       - 00000000
>... INITRD_START      - 00000000
>... INITRD_SIZE       - 00000000
>Booting machvec: RTS7751R2D
>Renesas Technology Sales RTS7751R2D support.
>FPGA version:1 (revision:0)
>Node 0: start_pfn = 0xc000, low = 0x10000
>Zone PFN ranges:
>  Normal   0x0000c000 -> 0x00010000
>Movable zone start PFN for each node
>early_node_map[1] active PFN ranges
>    0: 0x0000c000 -> 0x00010000
>Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
>Kernel command line: root=/dev/sda rw init=/usr/sbin/init.sh panic=1
> PATH=/usr/distcc:/usr/bin console=ttySC0 DISTCC_HOSTS=10.0.2.2:28739/4
> CPUS=4 NR_IRQS:256
>Using R2D-PLUS interrupt controller.
>PID hash table entries: 256 (order: 8, 1024 bytes)
>Console: colour dummy device 80x25
>Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
>Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
>Memory: 61072k/65536k available (2306k kernel code, 598k data, 116k init)
>PVR=04050005 CVR=00110000 PRR=00000113
>I-cache : n_ways=2 n_sets=64 way_incr=2048
>I-cache : entry_mask=0x000007e0 alias_mask=0x00000000 n_aliases=0
>D-cache : n_ways=2 n_sets=64 way_incr=2048
>D-cache : entry_mask=0x000007e0 alias_mask=0x00000000 n_aliases=0
>Calibrating delay loop (skipped)... 120.00 BogoMIPS PRESET (lpj=240000)
>Mount-cache hash table entries: 512
>CPU: SH7751R
>net_namespace: 520 bytes
>NET: Registered protocol family 16
>PCI: Starting intialization.
>PCI: Using configuration type 1
>registering PCI controller with io_map_base unset
>bio: create slab <bio-0> at 0
>SCSI subsystem initialized
>usbcore: registered new interface driver usbfs
>usbcore: registered new interface driver hub
>usbcore: registered new device driver usb
>NET: Registered protocol family 2
>IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
>TCP established hash table entries: 2048 (order: 2, 16384 bytes)
>TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
>TCP: Hash tables configured (established 2048 bind 2048)
>TCP reno registered
>NET: Registered protocol family 1
>trapped io 0xc0000000 overrides mmio 0xb4001000
>trapped io 0xc0001000 overrides mmio 0xb400080c
>squashfs: version 4.0 (2009/01/31) Phillip Lougher
>msgmni has been set to 119
>io scheduler noop registered
>io scheduler anticipatory registered (default)
>io scheduler deadline registered
>io scheduler cfq registered
>pci_hotplug: PCI Hot Plug PCI Core version: 0.5
>Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
>SuperH SCI(F) driver initialized
>sh-sci: ttySC0 at MMIO 0xffe80000 (irq = 40) is a scif
>console [ttySC0] enabled
>brd: module loaded
>sm501 sm501: SM501 At b3e00000: Version 050100a0, 8 Mb, IRQ 100

And hangs at that point.

I've managed to bisect it to kernel commit 
8be5f1a68f2c14082939dd54e7037dcee2eb54f8 which is messing around with the 
timer code.

Attached is the .config I'm building with.  If you need the toolchain, it's at 
http://impactlinux.com/fwl/downloads/binaries/cross-static-sh4.tar.bz2

I dunno if this is a kernel issue or a qemu issue, so I thought I'd ping both 
lists.

Rob
-- 
Latency is more important than throughput. It's that simple. - Linus Torvalds

View attachment "config1" of type "text/plain" (36441 bytes)