On Tue, Apr 07, 2020 at 11:19:12AM +0100, Russell King - ARM Linux admin wrote: > On Tue, Apr 07, 2020 at 11:02:03AM +0100, Russell King - ARM Linux admin wrote: > > On Mon, Apr 06, 2020 at 10:27:20AM +0200, Corentin Labbe wrote: > > > Hello > > > > > > I am trying to add the last missing Allwinner Soc in kernelci: the A80. > > > But this SoC does not have any way to be used in kernelci, no USB nor network in uboot. > > > So I have tried to fake uboot since the kernel has network support and run the new kernel via kexec. > > > > > > But kexec 2.0.18 fail to work: > > > kexec --force /tmp/kernel --initrd /tmp/ramdisk --dtb /tmp/dtb --command-line='console=ttyS0,115200n8 root=/dev/ram0 earlycon=uart,mmio32,0x7000000 ip=dhcp' > > > > As I mentioned in my other reply, this apparent "kexec" command line > > does not seem to reflect the arguments you actually used to invoke > > the kexec output below. > > > > > syscall kexec_file_load not available. > > > > This message is produced by do_kexec_file_load(). This function is only > > invoked if the do_kexec_file_syscall flag in main() is set. This flag > > is only set if one of: > > > > --kexec-file-syscall > > --kexec-syscall > > --kexec-syscall-auto > > -s > > -c > > -a > > > > are provided on the kexec command line. Your command line above does > > not contain any of those arguments, so either the command line is not > > what you used, or you are using a patched kexec, or your compiler is > > grossly miscompiling kexec. > > > > > Try gzip decompression. > > > kernel: 0xb6535008 kernel_size: 0x853200 > > > MEMORY RANGES > > > 0000000020000000-000000009fffffff (0) > > > > Then there's the debug output, which is only produced if the > > kexec_debug global is set, which in turn is only set if --debug or -d > > is supplied on the kexec command line - which again, your kexec > > command line does not contain this. > > > > > zImage header: 0x016f2818 0x00000000 0x00853200 > > > zImage size 0x853200, file size 0x853200 > > > zImage requires 0x00864200 bytes > > > offset 0x0000bae4 tag 0x5a534c4b size 8 > > > Decompressed kernel sizes: > > > text+data 0x0158b3a0 bss 0x000632f0 total 0x015ee690 > > > Resulting kernel space: 0x01def5a0 > > > Kernel: address=0x20008000 size=0x01def5a0 > > > Initrd: address=0x21df8000 size=0x0090b6fa > > > DT : address=0x22704000 size=0x00005c09 > > > kexec_load: entry = 0x20008000 flags = 0x280000 > > > nr_segments = 3 > > > segment[0].buf = 0xb6535008 > > > segment[0].bufsz = 0x853204 > > > segment[0].mem = 0x20008000 > > > segment[0].memsz = 0x854000 > > > segment[1].buf = 0xb5c29008 > > > segment[1].bufsz = 0x90b6fa > > > segment[1].mem = 0x21df8000 > > > segment[1].memsz = 0x90c000 > > > segment[2].buf = 0x4db50 > > > segment[2].bufsz = 0x5c09 > > > segm[ 71.039126] kexec_core: Starting new kernel > > > ent[2].mem = 0[ 71.044712] Disabling non-boot CPUs ... > > > x22704000 > > > segment[2].memsz = 0x6000 > > > [ 71.489070] Bye! > > > > > > > > > I have tried also kexec-2.0.20 > > > Try gzip decompression. > > > zImage header: 0x00000000 0x000019b4 0x00001000 > > > zImage requires 0x008641c0 bytes > > > Could not find a free area of memory of 0x86c1c0 bytes... > > > Cannot load /tmp/kernel > > > > kexec 2.0.20 doesn't appear to have changed anything to do with how > > allocations are done. The above output looks even more strange and > > confusing. "zImage header" is produced by debugging prints, which > > imply that kexec_debug was set. > > > > However, the "MEMORY RANGES" output is missing - this has not gone > > away with kexec 2.0.20, it's still there, and works for me (I've > > just built and tested kexec 2.0.20). > > > > Also, the values on the "zImage header" line are completely messed > > up; the first should be the zImage magic value and it is not - that > > suggests that the file being loaded is not a zImage file, or is > > corrupted. > > Under a VM (the kernel doesn't have kexec support - but that's not a > problem, because the initial loading stages are the relevant parts > which all happen in userspace): > > # build/sbin/kexec --version > kexec-tools 2.0.20 > # build/sbin/kexec --debug --load virt-vmlinuz-5.4.0+ > Try gzip decompression. > kernel: 0xb6a6c008 kernel_size: 0x407358 > MEMORY RANGES > 0000000040000000-000000007fffffff (0) > zImage header: 0x016f2818 0x00000000 0x00407358 > zImage size 0x407358, file size 0x407358 > zImage requires 0x00418358 bytes > offset 0x00007178 tag 0x5a534c4b size 12 > Decompressed kernel sizes: > text+data 0x00c2ed24 bss 0x000319ec total 0x00c60710 > Resulting kernel space: 0x0104707c > Kernel: address=0x40008000 size=0x0104707c > DT : address=0x41051000 size=0x00100000 > kexec_load: entry = 0x40008000 flags = 0x280000 > nr_segments = 2 > segment[0].buf = 0xb6a6c008 > segment[0].bufsz = 0x40735c > segment[0].mem = 0x40008000 > segment[0].memsz = 0x408000 > segment[1].buf = 0xb696b008 > segment[1].bufsz = 0x100000 > segment[1].mem = 0x41051000 > segment[1].memsz = 0x100000 > kexec_load failed: Function not implemented > entry = 0x40008000 flags = 0x280000 > nr_segments = 2 > segment[0].buf = 0xb6aa0008 > segment[0].bufsz = 0x40735c > segment[0].mem = 0x40008000 > segment[0].memsz = 0x408000 > segment[1].buf = 0xb699f008 > segment[1].bufsz = 0x100000 > segment[1].mem = 0x41051000 > segment[1].memsz = 0x100000 > # > > On a SolidRun Hummingboard2 (iMX6 based, which has kexec support, same > kexec binary, first without an initrd, and then with): > > # build/sbin/kexec --version > kexec-tools 2.0.20 > # build/sbin/kexec --debug --load multi-vmlinuz-5.6.0+ > Try gzip decompression. > kernel: 0xb6763008 kernel_size: 0x7273a8 > MEMORY RANGES > 0000000010000000-000000004fffffff (0) > zImage header: 0x016f2818 0x00000000 0x007273a8 > zImage size 0x7273a8, file size 0x7273a8 > zImage requires 0x007383a8 bytes > offset 0x00004da8 tag 0x5a534c4b size 12 > Decompressed kernel sizes: > text+data 0x00dbedb8 bss 0x007489f8 total 0x015077b0 > Resulting kernel space: 0x015077b0 > Kernel: address=0x10008000 size=0x015077b0 > DT : address=0x11511000 size=0x0000b000 > kexec_load: entry = 0x10008000 flags = 0x280000 > nr_segments = 2 > segment[0].buf = 0xb6763008 > segment[0].bufsz = 0x7273ac > segment[0].mem = 0x10008000 > segment[0].memsz = 0x728000 > segment[1].buf = 0x1207cb0 > segment[1].bufsz = 0xb000 > segment[1].mem = 0x11511000 > segment[1].memsz = 0xb000 > # build/sbin/kexec --unload > # build/sbin/kexec --debug --load multi-vmlinuz-5.6.0+ --initrd /boot/initrd.img-5.4.0+ > Try gzip decompression. > kernel: 0xb65d8008 kernel_size: 0x7273a8 > MEMORY RANGES > 0000000010000000-000000004fffffff (0) > zImage header: 0x016f2818 0x00000000 0x007273a8 > zImage size 0x7273a8, file size 0x7273a8 > zImage requires 0x007383a8 bytes > offset 0x00004da8 tag 0x5a534c4b size 12 > Decompressed kernel sizes: > text+data 0x00dbedb8 bss 0x007489f8 total 0x015077b0 > Resulting kernel space: 0x015077b0 > Kernel: address=0x10008000 size=0x015077b0 > Initrd: address=0x11510000 size=0x0053f46a > DT : address=0x11a50000 size=0x0000b044 > kexec_load: entry = 0x10008000 flags = 0x280000 > nr_segments = 3 > segment[0].buf = 0xb65d8008 > segment[0].bufsz = 0x7273ac > segment[0].mem = 0x10008000 > segment[0].memsz = 0x728000 > segment[1].buf = 0xb6098008 > segment[1].bufsz = 0x53f46a > segment[1].mem = 0x11510000 > segment[1].memsz = 0x540000 > segment[2].buf = 0x993cf0 > segment[2].bufsz = 0xb044 > segment[2].mem = 0x11a50000 > segment[2].memsz = 0xc000 > > On clearfog (Armada 388): > > # build/sbin/kexec --debug --load multi-vmlinuz-5.6.0+ > Try gzip decompression. > kernel: 0xb6745008 kernel_size: 0x7273a8 > MEMORY RANGES > 0000000000000000-000000003fffffff (0) > zImage header: 0x016f2818 0x00000000 0x007273a8 > zImage size 0x7273a8, file size 0x7273a8 > zImage requires 0x007383a8 bytes > offset 0x00004da8 tag 0x5a534c4b size 12 > Decompressed kernel sizes: > text+data 0x00dbedb8 bss 0x007489f8 total 0x015077b0 > Resulting kernel space: 0x015077b0 > Kernel: address=0x00008000 size=0x015077b0 > DT : address=0x01511000 size=0x00007be3 > kexec_load: entry = 0x8000 flags = 0x280000 > nr_segments = 2 > segment[0].buf = 0xb6745008 > segment[0].bufsz = 0x7273ac > segment[0].mem = 0x8000 > segment[0].memsz = 0x728000 > segment[1].buf = 0x1be7f68 > segment[1].bufsz = 0x7be3 > segment[1].mem = 0x1511000 > segment[1].memsz = 0x8000 > > All appears to work fine. > I have found a part of my problem, kexec-tool seems to always use the OPT_KEXEC_FILE_SYSCALL. Even if I set --kexec-syscall. On my early tries I got "syscall kexec_file_load not available." When I did a full rebuild of my buildroot to go back to kexec-tool 2.0.18, this syscall become availlable. The get_memory_ranges seems to be called only from my_load() which is executed when !do_kexec_file_syscall. Since kexec-tool always set do_kexec_file_syscall, it is never called. I have added a print for each syscal option, and it seems that OPT_KEXEC_SYSCALL_AUTO is called after the handling of OPT_KEXEC_SYSCALL. So I have hack to always set do_kexec_file_syscall=0 So now my test go further, but the final kernel crash. DEBUG: bootz: run kexec with /tmp/kernel --debug --kexec-syscall --force --initrd /tmp/ramdisk --dtb /tmp/dtb --command-line='console=ttyS0,115200n8 root=/dev/ram0 earlycon=uart,mmio32,0x7000000 ip=dhcp' Set DEBUG! main:1417 OPT_KEXEC_SYSCALL main:1422 OPT_KEXEC_SYSCALL_AUTO arch_process_options:119 main:1500 main:1517 res=0 do_load=1 main:1519 res=0 do_kexec_file_syscall=0 my_load:713 Try gzip decompression. kernel: 0xb693b008 kernel_size: 0x443ac0 get_memory_ranges:36 MEMORY RANGES 0000000020000000-000000009fffffff (0) DEBUG: my_load:737 memory_ranges=1 zImage_arm_load:423 zImage header: 0x016f2818 0x00000000 0x00443ac0 zImage size 0x443ac0, file size 0x443ac0 zImage requires 0x00454ac0 bytes offset 0x00006678 tag 0x5a534c4b size 8 Decompressed kernel sizes: text+data 0x00b78080 bss 0x0003d3c0 total 0x00bb5440 Resulting kernel space: 0x00fccb40 DEBUG: locate_hole:237 memory_ranges=1 Check 0/1 536870912 0 type=-1610612737 Check 0/1 536870912 0 Kernel: address=0x20008000 size=0x00fccb40 DEBUG: locate_hole:237 memory_ranges=1 Check 0/1 536870912 0 type=-1610612737 Check 0/1 536870912 0 Initrd: address=0x20fd5000 size=0x0167213d DEBUG: locate_hole:237 memory_ranges=1 Check 0/1 536870912 0 type=-1610612737 Check 0/2 536870912 0 Check 1/2 577011712 0 DT : address=0x22648000 size=0x00006043 kexec_load: entry = 0x20008000 flags = 0x280000 nr_segments = 3 segment[0].buf = 0xb693b008 segment[0].bufsz = 0x443ac4 segment[0].mem = 0x20008000 segment[0].memsz = 0x444000 segment[1].buf = 0xb52c8008 segment[1].bufsz = 0x167213d segment[1].mem = 0x20fd5000 segment[1].memsz = 0x1673000 segment[2].buf = 0x4ef88 segment[2].bufsz = 0x6043 segment[2].mem = 0x2[ 31.265096] sun7i-dwmac 830000.ethernet eth0: Link is Down 2648000 segment[2].memsz = 0x7000 main:1568 res=0 main:1582 res=0 do_exec=1 [ 31.277297] kexec_core: Starting new kernel [ 31.282700] Disabling non-boot CPUs ... [ 31.692085] Bye! C:0x200080C0-0x2044BAC0->0x20B80B00-0x20FC4500 _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
