[linuxsh-dev] (no subject)

[Gaurav K. <Gau...@no...>]

Hi Brian,

Why are you copying the entire kernel to RAM ?
You need to copy a few sections of it.

This feature is implemented in uClinux for sh (SH7751). You can search
the uClinux mailing lists for "Boot from ROM".

Before copying the rootfs check if it is loaded at 0x800F0000. The
address of the rootfs (initrd) is stored in initrd_start. Check its
value, if it correctly points to 0x88360000. The kernel tries to locate
the type of filesystem (and then loads it) by checking its contents.
Also check a first few bytes at initrd_start matches to your rootfs
(initrd).

Regards,
Gaurav
----------------------------------------------------

Need help..
We are trying to boot the linux kernel from flash rom.=3D20 But we =
always
get kernel panic when loading the filesystem.

We loaded the following to flash memory and add function in=3D20 sh-ipl
code to copy to RAM memory:

vmlinux    0x80010000 FLASH --> copy to 0x88210000 RAM
rootfs       0x800F0000 FLASH --> copy to 0x88360000 RAM

we sucessfully copied the files to RAM


[arch/sh/kernel/head.S]=3D20

 .section .empty_zero_page, "aw"
ENTRY(empty_zero_page)
 .long 1  /* MOUNT_ROOT_RDONLY */
 .long 0  /* RAMDISK_FLAGS */
 .long 0x0100  /* ORIG_ROOT_DEV */   <-- we changed to 0x0100
 .long 1  /* LOADER_TYPE */
 .long 0x00360000 /* INITRD_START */
 .long 0x000a0000 /* INITRD_SIZE */
 .long 0
 .balign 4096,0,4096

 .text=3D20


[part of sh-ipl config.h-sh2004]

#define CONFIG_ROM_START  0x80000000
#define CONFIG_ROM_LENGTH  0x10000
#define CONFIG_RAM_START  0x88000000
#define CONFIG_RAM_BOOT   (CONFIG_RAM_START+0x200000)
#define CONFIG_MEMORY_SIZE  get_memory_size()


[Boot up results]

Copying Kernel image from 0x80010000 to 0x88210000.Jumping to address =
=3D
0x88210000 .

Uncompressing Linux... Ok, booting the kernel.
Linux version 2.4.26 (hos...@ds...) (gcc \D!?\?C\c\o =3D
3.2.3) #9 20
04C?P 9?Ei 27Au ?EiIEAu 16:32:39 JST
SH-2004 Setup...done
On node 0 totalpages: 32768
zone(0): 32768 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: mem=3D3D128M console=3D3DttySC0,115200 Setting GDB =
trap
vector to 0x80000100
rtc62423_gettimeofday: initializing RTC
rtc62423_gettimeofday: RTC not found
CPU clock: 240.00MHz
Bus clock: 120.00MHz
Module clock: 60.00MHz
Interval =3D3D 150000
Calibrating delay loop... 239.20 BogoMIPS
Memory: 127952k/131072k available (3120k reserved including: 1410k =3D
kernel code, 50k data, 160k BSS, 52k init, 1408k page map) Dentry cache
hash table entries: 16384 (order: 5, 131072 bytes) Inode cache hash
table entries: 8192 (order: 4, 65536 bytes) Mount cache hash table
entries: 512 (order: 0, 4096 bytes) Buffer cache hash table entries:
8192 (order: 3, 32768 bytes) Page-cache hash table entries: 32768
(order: 5, 131072 bytes)
CPU: SH7750/SH7751
POSIX conformance testing by UNIFIX
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039 Initializing RT
netlink socket Starting kswapd
VFS: Disk quotas vdquot_6.5.1
Journalled Block Device driver loaded
pty: 256 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with no serial options enabled
SuperH SCI(F) driver initialized ttySC0 at 0xffe00000 is a SCI
ttySC1 at 0xffe80000 is a SCIF
Real Time Clock Driver v1.10f
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
ide: Assuming 50MHz system bus speed for PIO modes; override with =3D
idebus=3D3Dxx
ide3: ports already in use, skipping probe
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 1024 buckets, 8Kbytes
TCP: Hash tables configured (established 8192 bind 16384) Linux IP
multicast router 0.06 plus PIM-SM
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
VFS: Cannot open root device "" or 00:00 Please append a correct
"root=3D3D" boot option Kernel panic: VFS: Unable to mount root fs on
00:00



Does anyone had the same problem we encountered????
Is there something wrong or lacking with our method??


Thanks

Brian