RAMDISK Segv

Hello,

I am using the RAM disk supplied by DENX on
an 8275 FADS board. The kernel boots and
the RAM disk is loaded. busybox starts
and then I get segv's. Any idea as to
what is happening ?

Thanks
Kevin

=> tftpboot 100000 kernram
TFTP from server 192.168.90.13; our IP address is 192.168.90.3 Filename 'kernram'.
Load address: 0x100000
Loading: #################################################################
###################################
done
Bytes transferred = 511193 (7ccd9 hex)
=> tftpboot 300000 pRamdisk
TFTP from server 192.168.90.13; our IP address is 192.168.90.3 Filename 'pRamdisk'.
Load address: 0x300000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
##############
done
Bytes transferred = 1400262 (155dc6 hex)
=> setenv bootargs root=/dev/ram
=> setenv bootargs root=/dev/ram rw
=> bootm 100000 300000
## Booting image at 00100000 ...
Image Name: Linux-2.4.20
Image Type: PowerPC Linux Kernel Image (gzip compressed)
Data Size: 511129 Bytes = 499.1 kB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
Uncompressing Kernel Image ... OK
## Loading RAMDisk Image at 00300000 ...
Image Name: Simple Embedded Linux Framework
Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
Data Size: 1400198 Bytes = 1.3 MB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
Loading Ramdisk to 01a38000, end 01b8dd86 ... OK
Memory BAT mapping: BAT2=32Mb, BAT3=0Mb, residual: 0Mb
Total memory = 32MB; using 64kB for hash table (at c0140000) Linux version 2.4.20 (kevin@linux4) (gcc version 3.2.1) #89 Wed Dec 3 13:20:42 EST 2003
ADS setup arch
On node 0 totalpages: 8192
zone(0): 8192 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: root=/dev/ram rw nobats ip=192.168.90.3
ADS init IRQ. NR_IRQS=256
ADS time init
ADS calibrate decrementer. FREQ=66000000, tb_ticks_per_jiffy=165000 Calibrating delay loop... 131.07 BogoMIPS
Memory: 29696k available (868k kernel code, 336k data, 48k init, 0k highmem) Dentry cache hash table entries: 4096 (order: 3, 32768 bytes) Inode cache hash table entries: 2048 (order: 2, 16384 bytes) Mount-cache hash table entries: 512 (order: 0, 4096 bytes) Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes) Page-cache hash table entries: 8192 (order: 3, 32768 bytes) POSIX conformance testing by UNIFIX
ADS init
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039 Initializing RT netlink socket
Starting kswapd
devfs: v1.12c (20020818) Richard Gooch ([email protected])
devfs: devfs_debug: 0x0
devfs: boot_options: 0x1
pty: 256 Unix98 ptys configured
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)
MTD Sharp chip driver <[email protected]>
MPC8260ADS flash SIMM: 8192KB at FF800000
Looks like sharp flash
Creating 1 MTD partitions on "Flash SIMM":
0x00040000-0x00700000 : "JFFS2"
MPC8260 FCC Ethernet driver
BD rings initialised, RBASE=1A18160, TBASE=1A18360
Created eth0
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 2048 bind 4096)
eth0: OPEN
IP-Config: Guessing netmask 255.255.255.0
IP-Config: Complete:
device=eth0, addr=192.168.90.3, mask=255.255.255.0, gw=255.255.255.255, host=192.168.90.3, domain=, nis-domain=(none), bootserver=255.255.255.255, rootserver=255.255.255.255, rootpath=
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
RAMDISK: Compressed image found at block 0
Freeing initrd memory: 1367k freed
VFS: Mounted root (ext2 filesystem).
Mounted devfs on /dev
Freeing unused kernel memory: 48k init
000 init/main.c:590-init-Starting execs
000 init/main.c:597-init-Exec /sbin/init done
SIGSEGV

BusyBox v0.60.1 (2002.10.24-02:29+0000) Built-in shell (msh) Enter 'help' for a list of built-in commands.

# ls /
SIGSEGV
#

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We had such problem with busybox and it was related to the buffer allocation policy (in busybox). We changed allocation policy from "Allocate with stack" to "Allocate with .bss" and problem gone.

Dimitry

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The images have all been tested and are working fine here. It must be a problem on Kevin's system - either memory map related, or the usual culprit (SDRAM initialization).

Best regards,

Wolfgang Denk

--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: [email protected] There is an order of things in this universe.
-- Apollo, "Who Mourns for Adonais?" stardate 3468.1

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Which sort of boot loader are you suing, and what is your memory map (for example, at which physical addresses are the IMMR, BCSR etc. mapped)?

My speculation is that your memory map is broken.

Best regards,

Wolfgang Denk

--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: [email protected] "Plan to throw one away. You will anyway."
- Fred Brooks, "The Mythical Man Month"

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