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Sun, 03 Jun 2007

I've just booted 2.6.22-rc2 Linux kernel on SuperH 7751R CPU (LANDISK board).

Dmesg:

SH IPL+g version 0.9, Copyright (C) 2000 Free Software Foundation, Inc.

This software comes with ABSOLUTELY NO WARRANTY; for details type `w'.
This is free software, and you are welcome to redistribute it under
certain conditions; type `l' for details.

2002/09/09 Making.  2004/09/08 I-O DATA NSU Update.
266:133:33 on base clock 22.22MHz and SDRAM 4 burst. CF boot.

PCIC initialization done.
MASTER:48bit LBA mode non support
Disk drive detected: LEXAR ATA FLASH V1.00 11014102039199095066 
LBA: 001EBF10
DiskSize: 1031675904Byte
PIO MODE1
Set Transfer Mode result: 50 
> b
Set Transfer Mode result: 50 
Initialize Device Parameters result: 50 
IDLE result: 50 
Starting from MBR
Error
00000000
Jumping to second stage
checksum: 0x4f222fe6 
input_len: 0x0010baf4 
input_data: 0x8c80300c 
Uncompressing Linux... 

insize: 0x00000000 
inptr: 0x00000000 

insize: 0x0010baf4 
inptr: 0x00000001 Ok, booting the kernel.
cၲͥrrjj:ͪͪj"Bjɕ
B:ͥrrJсRչҚҒ
ISHV$&'H.]X_pfn = 0xc000, low = 0xe000
Zone PFN ranges:
  Normal      49152 ->    57344
early_node_map[1] active PFN ranges
    0:    49152 ->    57344
Node 0: mem_map starts at 8c1eb000
I-O DATA DEVICE, INC. "LANDISK Series" support.
Built 1 zonelists.  Total pages: 8128
Kernel command line: console=ttySC1,9600 console=tty0 mem=32M
Setting GDB trap vector to 0x80000100
PID hash table entries: 128 (order: 7, 512 bytes)
Using tmu for system timer
Using 8.333 MHz high precision timer.
Console: colour dummy device 80x25
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 30520k/30520k available (1345k kernel code, 2248k reserved, 438k data, 72k init)
PVR=04050005 CVR=20480000 PRR=00000113
I-cache : n_ways=2 n_sets=256 way_incr=8192
I-cache : entry_mask=0x00001fe0 alias_mask=0x00001000 n_aliases=2
D-cache : n_ways=2 n_sets=512 way_incr=16384
D-cache : entry_mask=0x00003fe0 alias_mask=0x00003000 n_aliases=4
Mount-cache hash table entries: 512
CPU: SH7751R
NET: Registered protocol family 16
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
Autoconfig PCI channel 0x8c1bacc0
Scanning bus 00, I/O 0xfe240000:0xfe280000, Mem 0xfd000000:0xfe000000
00:00.0 Class 0200: 10ec:8139 (rev 20)
        I/O at 0xfe240000 [size=0x100]
        Mem at 0xfd000000 [size=0x100]
00:02.0 Class 0c03: 1033:0035 (rev 43)
        Mem at 0xfd001000 [size=0x1000]
00:02.1 Class 0c03: 1033:0035 (rev 43)
        Mem at 0xfd002000 [size=0x1000]
00:02.2 Class 0c03: 1033:00e0 (rev 04)
        Mem at 0xfd003000 [size=0x100]
PCI: Using configuration type 1
Time: SuperH clocksource has been installed.
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 1024 (order: 1, 8192 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
TCP reno registered
gio: driver initialized
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled
SuperH SCI(F) driver initialized
sh-sci: ttySC0 at MMIO 0xffe00000 (irq = 25) is a sci
sh-sci: ttySC1 at MMIO 0xffe80000 (irq = 43) is a scif
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: module loaded
8139too Fast Ethernet driver 0.9.28
8139too 0000:00:00.0: This (id 10ec:8139 rev 20) is an enhanced 8139C+ chip
8139too 0000:00:00.0: Use the "8139cp" driver for improved performance and stability.
eth0: RealTek RTL8139 at 0xfd000000, 00:a0:b0:6c:d0:eb, IRQ 5
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
ehci_hcd 0000:00:02.2: EHCI Host Controller
ehci_hcd 0000:00:02.2: new USB bus registered, assigned bus number 1
ehci_hcd 0000:00:02.2: irq 5, io mem 0xfd003000
ehci_hcd 0000:00:02.2: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 5 ports detected
ohci_hcd 0000:00:02.0: OHCI Host Controller
ohci_hcd 0000:00:02.0: new USB bus registered, assigned bus number 2
ohci_hcd 0000:00:02.0: irq 7, io mem 0xfd001000
usb usb2: configuration #1 chosen from 1 choice
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 3 ports detected
ohci_hcd 0000:00:02.1: OHCI Host Controller
ohci_hcd 0000:00:02.1: new USB bus registered, assigned bus number 3
ohci_hcd 0000:00:02.1: irq 8, io mem 0xfd002000
usb usb3: configuration #1 chosen from 1 choice
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
usbcore: registered new interface driver libusual
heartbeat: version 0.1.0 loaded
TCP cubic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
VFS: Cannot open root device "" or unknown-block(0,0)
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
I'm now accepting congratulations.

Although Linux is well supported on that board, and actually it was preinstalled there (until OpenBSD developer's hands murdered it on/from compact flash), this is a serious step for me.
It is second non-x86 CPU I managed to start Linux on. First one was ppc32 (AMCC 405 GPr), I ported Linux to our company's own board about two years ago (although initial loader was not written by me too).
So, I only wrote an initial loader in SuperH asm, which resides in CF's MBR, it reads linux image from predefined offset from CF into RAM and jumps there. It does not initialize caches, MMU and other parameters, since it was done by IPL (Initial Program Loader), which resides on NAND flash, and actually board boots from that flash, and only later that code jumps into CF's MBR.
Loader does not even initialize command line, but can perform a checksum of the image, which can be tested against checksum written to the compact flash.

I will play a bit with this board until Grange returns from OpenBSD hackathon. I will try to setup a partition table and filesystem, so that userspace could be started there.
Actually when he will return, I will ask for Xscale board theirs company develop. They run Linux there without serious problems (it is based on ixp425(?)), but Linux in general sucks on that CPU, since it does not have support for scheduling domains (upto 16), which allows to greatly improve rescheduling latency (or they are not turned on, or whatever, I was quite surprised about that news actually). OpenBSD has such support, and there is a patch for Linux 2.6, but it is quite broken (for example shared memory does not work).

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