2011/9/15 Dennis Flynn <dennis.flynn at ericsson.com>: > >> I assume this is 512M? > Yes, 512M. > >> It appears to have allocated a segment at this address. Can you try adding debug statements to exec to see the contents of this segment? I suspect kexec is loading nothing since it does not have an ELF header to load for the uImage case. > > I added code to default_machine_kexec() to ioremap the segment[2].mem physical address and then use print_hex_dump() to dump the contents of this segment. Looks like the ELF header signature is present. Just not visible via /dev/oldmem from the crash kernel? > But should /dev/oldmem have elf header? As I remember it is constructing when you read from /proc/vmcore. > > ioremap vaddr 0xe086e000 --> paddr 0x2086e000 (size=1000) > e086e000: 7f454c46 01020100 00000000 00000000 ?.ELF............ > e086e010: 00040014 00000001 00000000 00000034 ?...............4 > e086e020: 00000000 00000000 00340020 00050000 ?.........4. .... > e086e030: 00000000 00000004 0189221c 00000000 ?.........."..... > e086e040: 0189221c 00000400 00000400 00000000 ?.."............. > e086e050: 00000000 00000004 00866df8 00000000 ?..........m..... > e086e060: 00866df8 00001000 00001000 00000000 ?..m............. > e086e070: 00000000 00000001 2085e000 c0000000 ?........ ....... > e086e080: 00000000 00010000 00010000 00000007 ?................ > e086e090: 00000000 00000001 00010000 c0010000 ?................ > e086e0a0: 00010000 1fff0000 1fff0000 00000007 ?................ > e086e0b0: 00000000 00000001 30000000 ffffffff ?........0....... > e086e0c0: 30000000 50000000 50000000 00000007 ?0...P...P....... > e086e0d0: 00000000 00000000 00000000 00000000 ?................ > > [ remaining zero-filled locations deleted ] > > Dennis > > -----Original Message----- > From: McClintock Matthew-B29882 [mailto:B29882 at freescale.com] > Sent: Tuesday, September 13, 2011 5:43 PM > To: Dennis Flynn > Cc: kexec at lists.infradead.org; McClintock Matthew-B29882 > Subject: Re: vmcore_init() failure using uImage on fsl_booke > > On Tue, Sep 13, 2011 at 4:33 PM, Dennis Flynn <dennis.flynn at ericsson.com> wrote: >> Reserved crash kernel memory: crashkernel=256M at 512 > > I assume this is 512M? > >> Reading 16 bytes from address 0x000000002086E000 within /dev/oldmem 00 >> 00 00 00 00 00 00 00 >> Warning: Core image elf header not found >> Kdump: vmcore not initialized >> >> Here's the crash kernel bootline showing the elfcorehdr argument passed to the crash kernel. >> >> Kernel command line: irqpoll maxcpus=1 reset_devices boot_mode=crash >> root=/dev/nfs >> nfsroot=127.3.252.1:/var/export/hitchhiker-6kn/current/rootfs >> ip=127.3.10.1:127.3.252.1:127.3.252.1:255.255.0.0:hitchhiker-6kn:eth0: >> off ?rbn_net_dev=eth0 console=ttyS0,115200 dump_type=kernel >> dump_server=0.0.0.0 dump_server_port=9999 hwether=x board_name=wolf_lc >> slot_number=255 ?elfcorehdr=532920K savemaxmem=2048M >> >> To help me debug all of this I added some debug prints to the powerpc kexec code (default_machine_kexec()) so I could verify the kernel kimage and memory segment contents. See below. >> >> Bye! >> Calling reboot_code_buffer (vaddr:0xe086f000): page_list=0x00000004, >> reboot_code_buffer_phys=0x2086f000, start=0x2fffa724 >> >> Dumping kimage @ 0xdfbdf800 >> ?head: 0x00000004 >> ?entry: 0xdfbdf800 >> ?last_entry: 0xdfbdf800 >> ?destination: 0x00000000 >> ?start: 0x2fffa724 >> ?control_code_page: 0xc0c97de0 >> ?swap_page: 0x ?(null) >> ?control_page: 0x2086ffff >> ?type: 0x00000001 >> ?preserve_context: 0x00000000 >> nr_segments = 5 >> segment[0].buf ? = 48831008 >> segment[0].bufsz = 75d640 >> segment[0].mem ? = 0x20000000 >> segment[0].memsz = 85e000 >> segment[1].buf ? = 1007d988 >> segment[1].bufsz = 10000 >> segment[1].mem ? = 0x2085e000 >> segment[1].memsz = 10000 >> segment[2].buf ? = 1007d350 >> segment[2].bufsz = 400 >> segment[2].mem ? = 0x2086e000 >> segment[2].memsz = 1000 > > It appears to have allocated a segment at this address. Can you try adding debug statements to exec to see the contents of this segment? I suspect kexec is loading nothing since it does not have an ELF header to load for the uImage case. > > -M > > _______________________________________________ > kexec mailing list > kexec at lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec > -- Best regards, Maxim Uvarov
