>31/07/2019, 14:30, "Bhupesh Sharma" <bhsharma@xxxxxxxxxx> wrote:> On Mon, Jul 29, 2019 at 1:36 PM Maikel Coenen <maikel.coenen@xxxxxxxxx> wrote: > > > > > On 29/07/2019, 07:02, "Bhupesh Sharma" <bhsharma@xxxxxxxxxx> wrote:> > > > > > Hi Maikel, > > > > > > I have a couple of queries (so that I can help you better). Please see > > > them in-line: > > > > > > On 07/24/2019 02:43 PM, Maikel Coenen wrote: > > > > Hi, > > > > > > > > I have met an issue during loading a new kernel with Kexec on an ARMv5 SoC. The kernel is a 4.19 with Gzip compression but during loading Kexec does not recognize the compression. > > > > > > > > If I load the new kernel and dtb with: > > > > > > > > kexec -l /boot/zImage -d --dtb=/boot/u-boot.dtb > > > > > > Can you please show the output of the following command: > > > $ file /boot/zImage > > > > zImage: Linux kernel ARM boot executable zImage (little-endian) > > > > I also performed a binwalk with following output: > > DECIMAL HEXADECIMAL DESCRIPTION > > -------------------------------------------------------------------------------- > > 0 0x0 Linux kernel ARM boot executable zImage (little-endian) > > 16424 0x4028 gzip compressed data, maximum compression, from Unix, last modified: 1970-01-01 00:00:00 (null date) > > > > > Also can you please make sure that the zImage has the right gzip header > > > : magic header 0x1f, 0x8b (\037 \213) > > > > As you can see in the binwalk output, is the magic header found at 0x4028. This because of the zImage header. > > When I check the zImage manually, it is indeed at that location. > > > > > > The output is: > > > > > > > > Try gzip decompression. > > > > Try LZMA decompression. > > > > lzma_decompress_file: read on /boot/zImage of 65536 bytes failed > > > > kernel: 0xb6a68008 kernel_size: 0x494d30 > > > > MEMORY RANGES > > > > 0000000000000000-000000000fffffff (0) > > > > zImage header: 0x016f2818 0x00000000 0x00494d30 > > > > zImage size 0x494d30, file size 0x494d30 > > > > kexec_load: entry = 0x8000 flags = 0x280000 > > > > nr_segments = 2 > > > > segment[0].buf = 0xb6a68008 > > > > segment[0].bufsz = 0x494d30 > > > > segment[0].mem = 0x8000 > > > > segment[0].memsz = 0x495000 > > > > segment[1].buf = 0x1fcf060 > > > > segment[1].bufsz = 0x245b > > > > segment[1].mem = 0x16f2000 > > > > segment[1].memsz = 0x3000 > > > > > > > > Looking at the debug, the function gzdirect returns “1” which indicates the kernel compression is not of gzip but I definitely use gzip. > > > > I also tested it with LZMA compression and uImage instead of zImage but all with the same outcome. > > > > > > > > To be complete, I use Kexec-tools 2.0.19 and zlib 1.2.11. > > > > > > > > Did I implement something wrong or how can I debug this further? > > > > > > I don't have a armv5 hardware and my attempt to setup a qemu + buildroot > > > setup for ARMv5 (926t) lead to a failure to boot the latest upstream kernel. > > > > > > I will try to fix up the setup and come back with more details. > > > In the meanwhile if you can share the above, I can have further look at > > > the same. > > Well, I can't reproduce the issue you reported at my end. > Here is my environment: > > $ qemu-system-arm --version > QEMU emulator version 2.11.2(qemu-2.11.2-5.fc28) > Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers > > # uname -rn > buildroot 4.19.16 > > # kexec -v > kexec-tools 2.0.18 > > # kexec -l zImage -d --dtb=versatile-pb.dtb > Try gzip decompression. > kernel: 0xb6c46008 kernel_size: 0x29cb48 > MEMORY RANGES > 0000000000000000-0000000007ffffff (0) > zImage header: 0x016f2818 0x00000000 0x0029cb48 > zImage size 0x29cb48, file size 0x29cb48 > zImage requires 0x002adb48 bytes > offset 0x00003934 tag 0x5a534c4b size 8 > Decompressed kernel sizes: > text+data 0x0050fe30 bss 0x00031de4 total 0x00541c14 > Resulting kernel space: 0x007bd978 > Kernel: address=0x00008000 size=0x007bd978 > DT : address=0x007c7000 size=0x00002278 > kexec_load: entry = 0x8000 flags = 0x280000 > nr_segments = 2 > segment[0].buf = 0xb6c46008 > segment[0].bufsz = 0x29cb4c > segment[0].mem = 0x8000 > segment[0].memsz = 0x29d000 > segment[1].buf = 0x47ca8 > segment[1].bufsz = 0x2278 > segment[1].mem = 0x7c7000 > segment[1].memsz = 0x3000 > > As you can see from the logs above the zImage format is correctly > recognized and decompressed. > > When I run 'kexec -e', I can launch the new kernel just fine. > > I don't see any new patches in 'kexec/arch/arm' folder between > kexec-tools 2.0.18 (at my end) and kexec-tools 2.0.19 (which you use), > so I am of the view that the issue is of the zImage image generation > probably. > > Since, 'kexec/arch/arm/kexec-zImage-arm.c' also supports uncompressed > kernel Image, you can try loading the Image file directly and see if > that makes a difference (you can find it here in the kernel tree: > arch/arm/boot/Image): > > # kexec -l Image -d --dtb=versatile-pb.dtb > Try gzip decompression. > kernel: 0xb5f3a008 kernel_size: 0xfc4f20 > MEMORY RANGES > 0000000000000000-0000000007ffffff (0) > zImage header: 0xeb00005a 0xeb000044 0xeb000009 > zImage requires 0x00fd5f20 bytes > Kernel: address=0x00008000 size=0x04f2dba0 > DT : address=0x04f37000 size=0x00002278 > kexec_load: entry = 0x8000 flags = 0x280000 > nr_segments = 2 > segment[0].buf = 0xb5f3a008 > segment[0].bufsz = 0xfc4f24 > segment[0].mem = 0x8000 > segment[0].memsz = 0xfc5000 > segment[1].buf = 0x47ca8 > segment[1].bufsz = 0x2278 > segment[1].mem = 0x4f37000 > segment[1].memsz = 0x3000 > > Thanks, > Bhupesh I previously build my kernel within the Yocto environment but now did it manually (Torvalds git 4.19) with the same result. Also checked my kernel configuration without positive results. I can successfully boot this kernel from u-boot. Also the uncompressed Image file gives the following result: # kexec -l /boot/Image -d --dtb=/boot/u-boot.dtb Try gzip decompression. Try LZMA decompression. lzma_decompress_file: read on /boot/Image of -1093035632 bytes failed kernel: 0xb6658008 kernel_size: 0x700f8c MEMORY RANGES 0000000000000000-000000000fffffff (0) zImage header: 0xeb00005a 0xeb000044 0xeb000009 zImage requires 0x00711f8c bytes Kernel: address=0x00008000 size=0x02359dbc DT : address=0x02363000 size=0x0000245b kexec_load: entry = 0x8000 flags = 0x280000 nr_segments = 2 segment[0].buf = 0xb6658008 segment[0].bufsz = 0x700f90 segment[0].mem = 0x8000 segment[0].memsz = 0x701000 segment[1].buf = 0x515058 segment[1].bufsz = 0x245b segment[1].mem = 0x2363000 segment[1].memsz = 0x3000 Are there special kernel configuration options I have to enable/disable which influences the zImage header? _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
