Hi,
On 15 July 2016 at 04:57, vinoth eswaran evinoth1206@gmail.com wrote:
Hi Mr.Simon Glass,
Currently I am working on an embedded project with Minnowmax Turbot.
I am checking the performance of different compression algorithms that can be employed in FIT image. I came across Brotli and felt that it might suit my use case.
I had integrated the Brotli to U-Boot and tested the compression algorithm performance. It doesn't work as expected and I had contacted the Brotli group with the test report:
https://groups.google.com/forum/#!topic/brotli/dg2gNlo61yI
There are certain configurations which I can enable to optimize the algorithm,
BROTLI_BUILD_32_BIT disables 64-bit optimizations BROTLI_BUILD_64_BIT forces to use 64-bit optimizations
With the BROTLI_BUILD_64_BIT , I am getting the following error messages :
[1.399921 0.114735] 4782061 bytes read in 115 ms (39.7 MiB/s) [1.403965 0.004044] Uncompressing Kernel Image ... [1.407913 0.003948] [1.407983 0.000070] brotli decompression start [1.411025 0.003042] General Protection [1.412884 0.001859] EIP: 0010:[<7b568599>] EFLAGS: 00010002 [1.416906 0.004022] Original EIP :[<fff13599>] [1.419852 0.002946] EAX: 00000001 EBX: 7833e748 ECX: 00000000 EDX: fffffff9 [1.425035 0.005183] ESI: 00000001 EDI: 01000000 EBP: 7833e848 ESP: 7833e6bc [1.430915 0.005880] DS: 0018 ES: 0018 FS: 0020 GS: 0018 SS: 0018 [1.435062 0.004147] CR0: 00000033 CR2: 00000000 CR3: 00000000 CR4: 00000600 [1.440859 0.005797] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [1.446064 0.005205] DR6: ffff0ff0 DR7: 00000400 [1.449103 0.003039] Stack: [1.449966 0.000863] 0x7833e6fc : 0x7833e848 [1.452891 0.002925] 0x7833e6f8 : 0x5c391d06 [1.455755 0.002864] 0x7833e6f4 : 0x7833fae8 [1.458056 0.002301] 0x7833e6f0 : 0x7833e750 [1.461008 0.002952] 0x7833e6ec : 0x7833fae4 [1.463962 0.002954] 0x7833e6e8 : 0x7833fae0 [1.466876 0.002914] 0x7833e6e4 : 0xf9ad562e [1.469842 0.002966] 0x7833e6e0 : 0x6eb7781b [1.472083 0.002241] 0x7833e6dc : 0xe3d562de [1.475045 0.002962] 0x7833e6d8 : 0x0756abd8 [1.477961 0.002916] 0x7833e6d4 : 0x875fabcb [1.480914 0.002953] 0x7833e6d0 : 0x957d8f8e [1.483862 0.002948] 0x7833e6cc : 0x7b58085f [1.486759 0.002897] 0x7833e6c8 : 0x7833e848 [1.489059 0.002300] 0x7833e6c4 : 0x01000000 [1.492064 0.003005] 0x7833e6c0 : 0x00000001 [1.494956 0.002892] --->0x7833e6bc : 0x7833e748 [1.497860 0.002904] 0x7833e6b8 : 0x00010002 [1.500719 0.002859] 0x7833e6b4 : 0x00000010 [1.503109 0.002390] 0x7833e6b0 : 0x7b568599 [1.505943 0.002834] ### ERROR ### Please RESET the board ###
U-Boot is always built in 32-bit mode for x86 at present. I just sent 3 patches to clarify that in the READMEs.
So you can't enable the 64-bit enhancements since the CPU is not in 64-bit mode in U-Boot (at least until the very last moment where it jumps to Linux if the kernel is 64-bit).
My kernel image is X86_64. I am not sure what is happening in u-boot(32-bit or 64-bit). I had gone though the following discussion in U-boot mailing list but not understanding what is happening,
http://lists.denx.de/pipermail/u-boot/2016-February/244191.html
Yes, see the patches I just sent. Hopefully it is clearer now.
Mit Freundlichen Grüßen VinothKumar +49 1798909072
Regards, Simon