Andrew Stanley-Jones <[EMAIL PROTECTED]> writes:
> Hi,
>
> I wasn't confident of the SDRAM setup on an embedded 486 machine, so I
> wrote a user space program to write and read mem to make sure everything
> was ok. Well when the program runs almost instantly it generates a oops
> (with eip in schedual). Assuming SDRAM setup was bad I added various
> checks in boot up to read and write mem. They didn't show any problems,
> I can read and write all I like, the mem works.
I have cc'd the linuxbios list, as that list is at least as appropriate
for this problem. When double checking memory you have to be certain
you are enabling memory bursts. Otherwise I have seen memory test out
fine that actually was missetup. The details are different on the 486
but the rest might not be.
> Attached is mem_test.c, in the 486 with 64 megs of mem testing with 5
> megs (mem_test 5242880) crashes instanly. With 4.5 megs (mem_test
> 4718592) it crashes on exit with varouis kernel bug/panic messages.
> With 4 megs everything is fine.
First without running crash through ksymoops no one else can debug
this.
Second which kernel patches have you applied?
There is a chance that you have some weird kernel driver that is
misbehaving and goofing up memory. Either that or your IDE driver
in linuxBIOS might not be disabling itself and
Third do you have any plans for contributing this code back to the
linuxBIOS project? There looks to be some interesting code in there.
Eric
>
> Here's the full logs for boot up from chip reset till Oops:
>
> Hello world!!
> RAM Setup, almost done with ASM
> Done with ASM, going to C
> Reached intel_main()
> <6>Finding PCI confiuration type...
> PCI: Using configuration type 1
> <6>Scanning PCI bus...<6>done
> <6>Enabling cache...<6>done.
> <6>Allocating PCI resources...COMPUTE_ALLOCATE: do IO
> compute_allocate_io: base 0xf000
> DEVIO: Bus 0x0, devfn 0x88, reg 0x0: iosize 0x20
> -->set base to 0xf000
> DEVIO: Bus 0x0, devfn 0x91, reg 0x1: iosize 0x100
> -->set base to 0xf020
> DEVIO: Bus 0x0, devfn 0xa0, reg 0x0: iosize 0x100
> -->set base to 0xf120
> BUS 0: set iolimit to 0xffff
> COMPUTE_ALLOCATE: do MEM
> compute_allocate_mem: base 0x10000000
> DEVMEM: Bus 0x0, devfn 0x88, reg 0x1: memsize 0x1000
> -->set base to 0x10000000
> DEVMEM: Bus 0x0, devfn 0x90, reg 0x0: memsize 0x1000000
> -->set base to 0x11000000
> DEVMEM: Bus 0x0, devfn 0x91, reg 0x0: memsize 0x1000
> -->set base to 0x12000000
> DEVMEM: Bus 0x0, devfn 0xa0, reg 0x1: memsize 0x1000
> -->set base to 0x12001000
> BUS 0: set memlimit to 0x120fffff
> COMPUTE_ALLOCATE: do PREFMEM
> Compute_allocate_prefmem: base 0x12100000
> BUS 0: set prefmemlimit to 0x120fffff
> ASSIGN RESOURCES, bus 0
> Bus 0x0 devfn 0x88 reg 0x0 base to 0xf001
> Bus 0x0 devfn 0x88 reg 0x1 base to 0x10000000
> Bus 0x0 devfn 0x90 reg 0x0 base to 0x11000000
> Bus 0x0 devfn 0x91 reg 0x0 base to 0x12000000
> Bus 0x0 devfn 0x91 reg 0x1 base to 0xf021
> Bus 0x0 devfn 0xa0 reg 0x0 base to 0xf121
> Bus 0x0 devfn 0xa0 reg 0x1 base to 0x12001000
> DEV Set command bus 0x0 devfn 0x0 to 0x4
> DEV Set command bus 0x0 devfn 0x88 to 0x3
> DEV Set command bus 0x0 devfn 0x90 to 0x2
> DEV Set command bus 0x0 devfn 0x91 to 0x3
> DEV Set command bus 0x0 devfn 0xa0 to 0x3
> <6>done.
> <6>Enabling extended BIOS access...<6>done.
> <6>Zeroing IRQ settings...<6>done.
> Bus: 0x0 Devfn: 0x0 [0x1022/0x3000] slot: 0 CMD: 0006
> Bus: 0x0 Devfn: 0x88 [0x1022/0x2000] slot: 17 pin: 1 irq: 11
> Bus: 0x0 Devfn: 0x88 [0x1022/0x2000] slot: 17 CMD: 0007
> Bus: 0x0 Devfn: 0x90 [0x10ea/0x5000] slot: 18 pin: 1 irq: 9
> Bus: 0x0 Devfn: 0x90 [0x10ea/0x5000] slot: 18 CMD: 0006
> Bus: 0x0 Devfn: 0x91 [0x10ea/0x5050] slot: 18 pin: 1 irq: 9
> Bus: 0x0 Devfn: 0x91 [0x10ea/0x5050] slot: 18 CMD: 0007
> Bus: 0x0 Devfn: 0xa0 [0x1317/0x0985] slot: 20 pin: 1 irq: 11
> Bus: 0x0 Devfn: 0xa0 [0x1317/0x0985] slot: 20 CMD: 0007
> <6>Enabling interrupts...<6>done.
> <6>Starting IDE
> +IdentifyATA(00003bf8)
> Flags=008a, CHS=234.2.32
> SerialNumber=''
> FirmwareVersion=''
> Model=''
> <6>Starting FAT
> MB:part[0]: bootid=x00 chs=1.1.0
> : sysid=x06 echs=1.32.64 startsec=32 size=4128
> MB:part[1]: bootid=x00 chs=0.1.65
> : sysid=x83 echs=1.96.129 startsec=4160 size=20544
> MB:part[2]: bootid=x00 chs=0.65.130
> : sysid=x83 echs=1.96.233 startsec=24704 size=6656
> MB:part[3]: bootid=x00 chs=0.0.0
> : sysid=x00 echs=0.0.0 startsec=0 size=0
> MB:sig=xaa55
> FAT Boot: jmp=eb.3c.90 name='mkdosfs' bps=512 spc=4 rsec=1
> : fats=2 dirs=512 sectors=4128 mediaid=xf8
> : spf=4 spt=32 heads=2 hsec=0 tsec=0
> ReadFBS: Bases: partofs=32 fatofs=33 dirofs=41 fileofs=73
> : fatsectors=4128 fatclusters=1013
> FatDir: at=x20= A --- 'VMLINUX .BIN'
> : case=00 cre=2a6f.54f7.00 acc=0000 ch=0 t=2a6f.54f7 sc=377
> size=768000
> Loading file: done!
> Read: VMLINUX.BIN (768000 bytes)
> Read: Success
> Jumping to linuxbiosmain()...
>
> Welcome to start32, the open sourced starter.
> This space will eventually hold more diagnostic information.
>
> January 2000, James Hendricks, Dale Webster, and Ron Minnich.
> Version 0.1
>
> Linux version 2.4.2ikd1 (asj@komeera) (gcc version 2.95.2 19991024
> (release)) #34 Thu Mar 15 10:31:25 PST 2001
> BIOS-provided physical RAM map:
> BIOS-e801: 000000000009f000 @ 0000000000000000 (usable)
> BIOS-e801: 0000000003e00000 @ 0000000000100000 (usable)
> On node 0 totalpages: 16128
> zone(0): 4096 pages.
> zone(1): 12032 pages.
> zone(2): 0 pages.
> Kernel command line: root=/dev/hda2 console=ttyS1,38400 ide0=reset
> ide_setup: ide0=reset
> Initializing CPU#0
> Calibrating delay loop... 50.07 BogoMIPS
> Memory: 61904k/64512k available (639k kernel code, 2220k reserved, 206k
> data, 56k init, 0k highmem)
> Checking if this processor honours the WP bit even in supervisor mode...
> Ok.
> Dentry-cache hash table entries: 8192 (order: 4, 65536 bytes)
> Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
> Page-cache hash table entries: 16384 (order: 4, 65536 bytes)
> Inode-cache hash table entries: 4096 (order: 3, 32768 bytes)
> CPU: Before vendor init, caps: 00000001 00000000 00000000, vendor = 2
> CPU: After vendor init, caps: 00000001 00000000 00000000 00000000
> CPU: After generic, caps: 00000001 00000000 00000000 00000000
> CPU: Common caps: 00000001 00000000 00000000 00000000
> CPU: AMD 486 DX/4-WB stepping 04
> Checking 'hlt' instruction... OK.
> Checking for popad bug... OK.
> POSIX conformance testing by UNIFIX
> PCI: Using configuration type 1
> PCI: Probing PCI hardware
> PCI: Scanning for ghost devices on bus 0
> PCI: IRQ init
> PCI: IRQ fixup
> PCI: Allocating resources
> PCI: Resource 0000f000-0000f01f (f=101, d=0, p=0)
> PCI: Resource 10000000-1000001f (f=200, d=0, p=0)
> PCI: Resource 11000000-11ffffff (f=200, d=0, p=0)
> PCI: Resource 12000000-12000fff (f=200, d=0, p=0)
> PCI: Resource 0000f000-0000f0ff (f=101, d=0, p=0)
> PCI: Cannot allocate resource region 1 of device 00:12.1
> PCI: Resource 0000f100-0000f1ff (f=101, d=0, p=0)
> PCI: Resource 12001000-120013ff (f=200, d=0, p=0)
> got res[1000:10ff] for resource 1 of PCI device 10ea:5050
> Linux NET4.0 for Linux 2.4
> Based upon Swansea University Computer Society NET3.039
> Starting kswapd v1.8
> pty: 256 Unix98 ptys configured
> block: queued sectors max/low 41077kB/13692kB, 128 slots per queue
> RAMDISK driver initialized: 16 RAM disks of 2048K size 1024 blocksize
> Uniform Multi-Platform E-IDE driver Revision: 6.31
> ide: Assuming 33MHz system bus speed for PIO modes; override with
> idebus=xx
> hda: SanDisk SDCFB-16, ATA DISK drive
> ide0: reset
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> hda: 31360 sectors (16 MB) w/1KiB Cache, CHS=490/2/32
> Partition check:
> hda: hda1 hda2 hda3
> Serial driver version 5.02 (2000-08-09) with DETECT_IRQ enabled
> ÿttyS01 at 0x02f8 (irq = 0) is a 16550A
> Linux Tulip driver version 0.9.13a (January 20, 2001)
> PCI: Setting latency timer of device 00:14.0 to 64
> eth0: ADMtek Comet rev 17 at 0xf100, 00:C0:26:A0:10:D1, IRQ 11.
> NET4: Linux TCP/IP 1.0 for NET4.0
> IP Protocols: ICMP, UDP, TCP
> IP: routing cache hash table of 512 buckets, 4Kbytes
> TCP: Hash tables configured (established 4096 bind 4096)
> hda: hda1 hda2 hda3
> hda: hda1 hda2 hda3
> VFS: Mounted root (ext2 filesystem) readonly.
> Freeing unused kernel memory: 56k freed
> INIT: version 2.76 booting
> /root/elan_cfg/elan_pci.o: /root/elan_cfg/elan_pci.o: No such file or
> directory
>
> Loading modules:
>
> Checking all file systems...
>
> fsck failed. Please repair manually.
>
> CONTROL-D will exit from this shell and continue system startup.
>
> EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
> Configuring and Starting Network...lo
> Local time (GMT): Wed Jun 2 00:00:12 UTC 1971
>
> Configuring serial ports...LSR safety check engaged!
> Cannot set seriaINIT: Entering runlevel: 2
> Starting base networking daemons: portmap inetd.
> Starting periodic command scheduler: cron.
>
> Lem -Linux Embedded- V0.61
> elan login: asj
> sh-2.04$ ./mem_test 5242880
> Doing Malloc
> Doing Write pattern: 0xaaaaaaaa
> Unable to handle kernel paging request at virtual address aaaaaab2
> printing eip:
> c012dba1
> *pde = 00000000
> Oops: 0000
> CPU: 0
> EIP: 0010:[<c012dba1>]
> EFLAGS: 00010213
> eax: aaaaaaaa ebx: c3c32000 ecx: 00000002 edx: 00000000
> esi: fffffff7 edi: 080789a0 ebp: 00000020 esp: c3c33fac
> ds: 0018 es: 0018 ss: 0018
> Process mem_test (pid: 64, stackpage=c3c33000)
> Stack: c012d122 c3c32000 bfffd7cc 080789a0 bfffd65c c0108e4b 00000002
> bfffd7cc
> 00000020 bfffd7cc 080789a0 bfffd65c 00000004 0000002b 0000002b
> 00000004
> 08066844 00000023 00000293 bfffd62c 0000002b
> Call Trace: [<c012d122>] [<c0108e4b>]
>
> Code: 8b 14 88 85 d2 74 03 ff 42 14 89 d0 c3 89 f6 8b 4c 24 04 ff
> Unable to handle kernel paging request at virtual address aaaaab2e
> printing eip:
> c0114fb4
> *pde = 00000000
> Oops: 0000
> CPU: 0
> EIP: 0010:[<c0114fb4>]
> EFLAGS: 00010287
> eax: 00000000 ebx: aaaaaaaa ecx: c3c91020 edx: 00000000
> esi: c113a000 edi: c3c32000 ebp: c01d4000 esp: c3c33e98
> ds: 0018 es: 0018 ss: 0018
> Process mem_test (pid: 64, stackpage=c3c33000)
> Stack: c3e7c180 c3c32000 0000000b c3c32000 c0115385 00000202 00015553
> aaaaaab2
> c0109340 0000000b 00000000 c010fb35 c01a4abe c3c33f78 00000000
> c3c32000
> 00000000 c010f824 00000020 c11fc1cc c11fc1b0 c11fae90 40001ffc
> 00030001
> Call Trace: [<c0115385>] [<c0109340>] [<c010fb35>] [<c010f824>]
> [<ffff0006>] [<c010f95c>] [<ffff0006>]
> [<c010f824>] [<c015f244>] [<c0119422>] [<c0108f64>] [<c0110018>]
> [<c012dba1>] [<c012d122>] [<c0108e4b>]
>
> Code: 39 bb 84 00 00 00 75 27 c7 43 5c 11 00 00 00 ff 83 80 05 00
>
> c012dad6 T chrdev_open
> c012db1f T kdevname
> c012db47 T cdevname
> c012db81 t sock_no_open
>
> Hope it helps,
>
> Andrew
> #include <stdio.h>
> #include <unistd.h>
> #include <stdlib.h>
>
> //#define SIZE 32*1024*1024
>
> unsigned int patt[] = {
> 0xaaaaaaaa,
> 0x55555555,
> 0xffffffff,
> 0xa5a5a5a5,
> 0x5a5a5a5a,
> 0x11111111,
> 0x22222222,
> 0x44444444,
> 0x88888888,
> 0x00000000
> };
>
>
> int main(int argc, char **argv){
>
> int i, k;
> unsigned int *mem, SIZE;
>
> if(argc < 2){
> printf("Format is: %s SIZE\n", argv[0]);
> exit(1);
> }
>
> SIZE = strtol(argv[1], 0x0, 0x0);
>
> fprintf(stderr, "Doing Malloc\n");
> mem = (unsigned int *) malloc(SIZE);
> for(k = 0; patt[k] != 0x0; k++){
> fprintf(stderr, "Doing Write pattern: 0x%08x\n", patt[k]);
> for(i = SIZE>>2; i > 0; i--){
> mem[i] = patt[k];
> }
> fprintf(stderr, "Doing Read pattern: 0x%08x\n", patt[k]);
> for(i = SIZE>>2; i > 0; i--){
> if(mem[i] != patt[k]){
> printf("Mem missmatch at: %d, with patt: 0x%08x\n", i, patt[k]);
>
> }
> }
> fprintf(stderr, "Done pattern: 0x%08x\n", patt[k]);
> }
> printf("\n");
> return 0;
> }
