linux crashes during the booting process. it is right at mounting the root file system through NFS server. the following is the trace. the root file system is based on redhat 7.1, could be used to boot 2.4 kernel. Any suggestions? Another problem is, if I want to compile in the hpt366.c, the kernel will hang right after it found the disk drive: (Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx HPT371: IDE controller at PCI slot 0000:00:0b.0 PCI: Enabling device 0000:00:0b.0 (0000 -> 0003) HPT371: chipset revision 2 HPT37X: using 33MHz PCI clock HPT371: 100% native mode on irq 5 ide2: BM-DMA at 0x1000-0x1007, BIOS settings: hde:pio, hdf:pio ide3: BM-DMA at 0x1008-0x100f, BIOS settings: hdg:pio, hdh:pio hdg: IBM-DTTA-350840, ATA DISK drive ) It just freeze there for ever :( a long email. I really appreciate the help and will give the feedback then. thanks OUTPUT: Linux version 2.6.12-mipscvs-20050626 (rolf@DBServer) (gcc version 3.4.4) #3 Fri Jul 1 13:25:50 PDT 2005 CPU revision is: 03030200 AMD Alchemy Au1550/Db1550 Board (PRId 03030200) @ 396MHZ BCLK switching enabled! Determined physical RAM map: memory: 0c000000 @ 00000000 (usable) Built 1 zonelists Kernel command line: ip=dhcp nfsroot=10.200.0.198:/db1550 console=ttyS0,115200 Primary instruction cache 16kB, physically tagged, 4-way, linesize 32 bytes. Primary data cache 16kB, 4-way, linesize 32 bytes. Synthesized TLB refill handler (17 instructions). Synthesized TLB load handler fastpath (34 instructions). Synthesized TLB store handler fastpath (34 instructions). Synthesized TLB modify handler fastpath (33 instructions). PID hash table entries: 1024 (order: 10, 16384 bytes) calculating r4koff... 00060ae0(396000) CPU frequency 396.00 MHz Dentry cache hash table entries: 32768 (order: 5, 131072 bytes) Inode-cache hash table entries: 16384 (order: 4, 65536 bytes) Memory: 190212k/196608k available (2486k kernel code, 6160k reserved, 617k data, 128k init, 0k highmem) Mount-cache hash table entries: 512 Checking for 'wait' instruction... unavailable. NET: Registered protocol family 16 Installing knfsd (copyright (C) 1996 okir@xxxxxxxxxxxx). Initializing Cryptographic API Serial: Au1x00 driver ttyS0 at I/O 0xb1100000 (irq = 0) is a AU1X00_UART ttyS1 at I/O 0xb1200000 (irq = 8) is a AU1X00_UART ttyS2 at I/O 0xb1400000 (irq = 9) is a AU1X00_UART io scheduler noop registered io scheduler anticipatory registered io scheduler deadline registered io scheduler cfq registered loop: loaded (max 8 devices) au1000eth version 1.5 Pete Popov <ppopov@xxxxxxxxxxxxxxxxx> eth0: Au1x Ethernet found at 0xb0500000, irq 27 eth0: AMD 79C874 10/100 BaseT PHY at phy address 31 eth0: Using AMD 79C874 10/100 BaseT PHY as default eth1: Au1x Ethernet found at 0xb0510000, irq 28 eth1: AMD 79C874 10/100 BaseT PHY at phy address 31 eth1: Using AMD 79C874 10/100 BaseT PHY as default Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx Db1550 Flash: probing 32-bit flash bus Db1550 Flash: Found 2 x16 devices at 0x0 in 32-bit bank Db1550 Flash: Found 2 x16 devices at 0x4000000 in 32-bit bank Amd/Fujitsu Extended Query Table at 0x0040 Db1550 Flash: CFI does not contain boot bank location. Assuming top. number of CFI chips: 2 cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness. Creating 3 MTD partitions on "Db1550 Flash": 0x00000000-0x07c00000 : "User FS" 0x07c00000-0x07d00000 : "YAMON" 0x07d00000-0x07fc0000 : "raw kernel" mice: PS/2 mouse device common for all mice NET: Registered protocol family 2 IP: routing cache hash table of 2048 buckets, 16Kbytes TCP established hash table entries: 8192 (order: 4, 65536 bytes) TCP bind hash table entries: 8192 (order: 3, 32768 bytes) TCP: Hash tables configured (established 8192 bind 8192) NET: Registered protocol family 1 NET: Registered protocol family 17 NET: Registered protocol family 15 Sending DHCP requests .<6>eth0: link up eth1: link up ., OK IP-Config: Got DHCP answer from 255.255.255.255, my address is 10.200.1.54 IP-Config: Complete: device=eth0, addr=10.200.1.54, mask=255.255.0.0, gw=10.200.0.1, host=10.200.1.54, domain=sel, nis-domain=(none), bootserver=255.255.255.255, rootserver=10.200.0.198, rootpath= Looking up port of RPC 100003/2 on 10.200.0.198 Reserved instruction in kernel code in arch/mips/kernel/traps.c::do_ri, line 706[#1]: Cpu 0 $ 0 : 00000000 1000fc00 00010000 00000000 $ 4 : 812b8e40 00000093 00000000 811df97c $ 8 : 00000040 812b9e40 00000000 812a4e10 $12 : 0000ffff 00200200 00100100 812a3ef4 $16 : 812b8e40 00000000 812b8e40 00000060 $20 : 8042a6e0 00010000 811df90c 80144b20 $24 : 00000000 00000001 $28 : 811de000 811df8f0 8042a6e0 802facd0 Hi : 00000000 Lo : 00000780 epc : 802ca258 sock_alloc_send_skb+0x74/0x5c8 Not tainted ra : 802facd0 ip_append_data+0x7c8/0xa34 Status: 1000fc03 KERNEL EXL IE Cause : 00800028 PrId : 03030200 Modules linked in: Process swapper (pid: 1, threadinfo=811de000, task=80456bf0) Stack : c600c80a 3601c80a 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000074 00000000 812b8e40 00000060 812b8e40 812b9e40 00000060 00000008 812b8e98 802facd0 00000000 00000093 00000000 811df97c 00000000 00000000 00000000 00000000 812b9e40 00000000 00000010 00000000 000005dc 00000000 ... Call Trace: [<802facd0>] ip_append_data+0x7c8/0xa34 [<8031e3c4>] udp_sendmsg+0x224/0xa08 [<802fa44c>] ip_generic_getfrag+0x0/0xbc [<802c6558>] sock_sendmsg+0xac/0xf0 [<80334890>] fn_hash_lookup+0x100/0x150 [<80334890>] fn_hash_lookup+0x100/0x150 [<80144b20>] autoremove_wake_function+0x0/0x44 [<802c65c0>] kernel_sendmsg+0x24/0x38 [<80362f48>] xdr_sendpages+0x1dc/0x29c [<80355284>] xprt_transmit+0xec/0x5f4 [<80144b20>] autoremove_wake_function+0x0/0x44 [<803529c4>] call_transmit+0x1f4/0x2d4 [<80356674>] rpc_delete_timer+0xdc/0x108 [<80357cb4>] __rpc_execute+0xa8/0x54c [<80420000>] init_mtdchar+0x20/0x60 [<80144b20>] autoremove_wake_function+0x0/0x44 [<8035976c>] rpcauth_bindcred+0xac/0x248 [<80144b20>] autoremove_wake_function+0x0/0x44 [<80420000>] init_mtdchar+0x20/0x60 [<80420000>] init_mtdchar+0x20/0x60 [<80420000>] init_mtdchar+0x20/0x60 [<80351d28>] rpc_call_sync+0x8c/0xd8 [<80351d14>] rpc_call_sync+0x78/0xd8 [<80361fdc>] pmap_create+0x74/0xc0 [<80420000>] init_mtdchar+0x20/0x60 [<803622e8>] rpc_getport_external+0x11c/0x180 [<80420000>] init_mtdchar+0x20/0x60 [<8041b854>] root_nfs_getport+0x8c/0xa8 [<80420000>] init_mtdchar+0x20/0x60 [<80254000>] snprintf+0x14/0x20 [<8041bb94>] nfs_root_data+0x324/0x3a8 [<80420000>] init_mtdchar+0x20/0x60 [<80128f24>] printk+0x1c/0x28 [<80144b20>] autoremove_wake_function+0x0/0x44 [<80420000>] init_mtdchar+0x20/0x60 [<8013e444>] flush_workqueue+0x28/0x34 [<80197f58>] path_lookup+0xe0/0x3d0 [<80194c78>] getname+0x28/0xf8 [<80198644>] __user_walk+0x78/0x94 [<80420000>] init_mtdchar+0x20/0x60 [<80409cb0>] mount_root+0xac/0x1c4 [<80144b20>] autoremove_wake_function+0x0/0x44 [<80420000>] init_mtdchar+0x20/0x60 [<80420000>] init_mtdchar+0x20/0x60 [<80409e10>] prepare_namespace+0x48/0x148 [<8013e444>] flush_workqueue+0x28/0x34 [<8010065c>] init+0x200/0x264 [<80100574>] init+0x118/0x264 [<80105e20>] kernel_thread_helper+0x10/0x18 [<80105e10>] kernel_thread_helper+0x0/0x18 Code: 10400091 0280f021 c20300a0 <0000102d> e20200a0 1040fffc 00000000 00032823 14a0009f Kernel panic - not syncing: Attempted to kill init! Also, I tried to run 2.4.31 on db1550, but got no luck to get the hard drive working, which also crashes during the probing process: probing for hda: present=0, media=32, probetype=ATA probing for hda: present=0, media=32, probetype=ATAPI probing for hdb: present=0, media=32, probetype=ATA probing for hdb: present=0, media=32, probetype=ATAPI probing for hdc: present=0, media=32, probetype=ATA probing for hdc: present=0, media=32, probetype=ATAPI probing for hdd: present=0, media=32, probetype=ATA probing for hdd: present=0, media=32, probetype=ATAPI probing for hde: present=0, media=32, probetype=ATA probing for hde: present=0, media=32, probetype=ATAPI probing for hdf: present=0, media=32, probetype=ATA probing for hdf: present=0, media=32, probetype=ATAPI probing for hdg: present=0, media=32, probetype=ATA hdg: IBM-DTTA-350840, ATA DISK drive probing for hdh: present=0, media=32, probetype=ATA probing for hdh: present=0, media=32, probetype=ATAPI Unable to handle kernel paging request at virtual address 00000000, epc == 801e77f0, ra == 801e7b48 Oops in fault.c::do_page_fault, line 206: