> 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? 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@xxxxxxxxxxxxx] 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
