[adding Kevin and Sjoerd who also noticed issues with this patch]
Hi Pankaj,
On 05/25/2016 11:43 PM, pankaj.dubey wrote:
> Hi Javier,
>
> On Wednesday 25 May 2016 08:32 PM, Javier Martinez Canillas wrote:
>> Hello Pankaj,
>>
>> On 05/25/2016 04:33 AM, pankaj.dubey wrote:
>>> Hi Javier,
>>>
>>>> Signed-off-by: Javier Martinez Canillas <javier@xxxxxxxxxxxxxxx>
>>>
>>> Just noticed that, current krzk/for-next failed to boot on Exynos5880
>>> based Chromebook device. Git bisect is showing culprit as this patch.
>>
>> Strange, krzk/for-next boots correctly on my Exynos5800 Peach Pi:
>>
>> $ git log --pretty=oneline --abbrev-commit HEAD
>> 35e691cf5165 Merge branch 'fixes-v4.7' into for-next
>>
>
> This is same as mine.
>
> My other build parameters are:
> defconfig: exynos_defconfig
> CROSS_COMPILE: gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux
I'm also using exynos_defconfig and a similar compiler
(gcc-linaro-arm-linux-gnueabihf-4.9-2015.01-3).
> rootfs: small cramfs
>
>> $ uname -r
>> 4.6.0-00073-g35e691cf5165
>>
>>> When I reverted this patch, its able to boot normally.
>>> Is there any missing patches that we need to take on krzk/for-next to
>>> boot on Chromebook.
>>>
>>
>
> Further I checked that, either I revert this patch OR do not reserve
> memory for MFC in exynos_reserve using following changes, both cases I
> am able to boot kernel on Chromebook (Exynos5800).
>
> diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
> index f977eea..e615e24 100644
> --- a/arch/arm/mach-exynos/exynos.c
> +++ b/arch/arm/mach-exynos/exynos.c
> @@ -268,7 +268,7 @@ static char const *const exynos_dt_compat[]
> __initconst = {
>
> static void __init exynos_reserve(void)
> {
> -#ifdef CONFIG_S5P_DEV_MFC
> +#ifndef CONFIG_S5P_DEV_MFC
> int i;
> char *mfc_mem[] = {
> "samsung,mfc-v5",
> @@ -280,6 +280,8 @@ static void __init exynos_reserve(void)
> for (i = 0; i < ARRAY_SIZE(mfc_mem); i++)
> if (of_scan_flat_dt(s5p_fdt_alloc_mfc_mem, mfc_mem[i]))
> break;
> +#else
> + pr_err("*****exynos_reserve Bypassing Memory Reservation for MFC
> ********\n");
> #endif
> }
>
>
>> No that I'm aware of. I wonder why it boots for me but fails for
>> you. Can you please share your complete boot log to see if there
>> are any hints there?
>>
>
> Following is failed boot log:
> U-Boot 2013.04-g8e3e5ef (May 26 2015 - 16:11:36) for Peach
>
> CPU: Exynos5422@900MHz
>
> Board: Google Peach Pi, rev 11.6
> I2C: ready
> DRAM: 3.5 GiB
> Relocation Offset dbd54000, base at ffb54000
> SPL stack at 2072c00, used 3f0, free 10
> PMIC max77802-pmic initialized
> CPU: Exynos5422@1800MHz
> TPS65090 PMIC EC init
> MMC: EXYNOS DWMMC: 0, EXYNOS DWMMC: 1
> SF: Detected W25Q32DW with page size 4 KiB, total 32 MiB
> In: cros-ec-keyb
> Out: lcd
> Err: lcd
> SF: Detected W25Q32DW with page size 4 KiB, total 32 MiB
> ELOG: Event(17) added with size 13
> Net: No ethernet found.
> Hit any key to stop autoboot: 0
> mmc1 is current device
> 4586144 bytes read in 242 ms (18.1 MiB/s)
> 26583040 bytes read in 1166 ms (21.7 MiB/s)
> ## Loading kernel from FIT Image at 20008000 ...
> Using 'conf@2' configuration
> Trying 'kernel@1' kernel subimage
> Description: unavailable
> Type: Kernel Image (no loading done)
> Compression: uncompressed
> Data Start: 0x200080c8
> Data Size: 4459024 Bytes = 4.3 MiB
> Verifying Hash Integrity ... OK
> ## Loading fdt from FIT Image at 20008000 ...
A difference I see is that I'm chain loading a non-verified u-boot and you
are loading a signed FIT image directly. But Sjoerd also chain loads a nv
u-boot and his Peach doesn't boot either so I don't think that's a cause.
> Using 'conf@2' configuration
> Trying 'fdt@2' fdt subimage
> Description: exynos5800-peach-pi.dtb
> Type: Flat Device Tree
> Compression: uncompressed
> Data Start: 0x20458148
> Data Size: 63002 Bytes = 61.5 KiB
> Architecture: ARM
> Hash algo: sha1
> Hash value: cd1c1703f744b44b1833ca61ec36b625665548de
> Verifying Hash Integrity ... sha1+ OK
> Booting using the fdt blob at 0x20458148
> XIP Kernel Image (no loading done) ... OK
> Loading Device Tree to 3ffe1000, end 3ffffb49 ... OK
> boot_kernel.c: ft_board_setup: warning: Must pass exactly one of vboot
> or cdata
>
> Starting kernel ...
>
> Timer summary in microseconds:
> Mark Elapsed Stage
> 0 0 reset
> 122,793 122,793 board_init_f
> 143,214 20,421 board_init_r
> 238,069 94,855 id=64
> 240,278 2,209 main_loop
> 4,841,682 4,601,404 bootm_start
> 4,841,683 1 id=1
> 4,846,604 4,921 id=100
> 4,846,607 3 id=101
> 4,846,607 0 id=102
> 4,850,208 3,601 id=110
> 4,877,729 27,521 id=105
> 4,877,731 2 id=106
> 4,877,734 3 id=107
> 4,877,735 1 id=108
> 4,877,736 1 id=109
> 4,882,406 4,670 id=90
> 4,882,408 2 id=92
> 4,882,408 0 id=91
> 4,927,272 44,864 id=95
> 4,927,274 2 id=96
> 4,927,276 2 id=97
> 4,927,277 1 id=98
> 4,927,279 2 id=99
> 4,937,617 10,338 id=7
> 4,951,899 14,282 id=15
> 4,955,112 3,213 start_kernel
>
> Accumulated time:
> 6,948 SPI read
> Uncompressing Linux... done, booting the kernel.
> [ 0.000000] Booting Linux on physical CPU 0x0
> [ 0.000000] Linux version 4.6.0-00073-g35e691c
> (pankaj@chromebld-server) (gcc version 4.9.2 20140904 (prerelease)
> (crosstool-NG linaro-1.13.1-4.9-2014.09 - Linaro GCC
> 4.9-2014.09) ) #59 SMP PREEMPT Thu May 26 08:21:07 IST 2016
> [ 0.000000] CPU: ARMv7 Processor [412fc0f3] revision 3 (ARMv7),
> cr=10c5387d
> [ 0.000000] CPU: div instructions available: patching division code
> [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction
> cache
> [ 0.000000] Machine model: Google Peach Pi Rev 10+
> [ 0.000000] bootconsole [earlycon0] enabled
> [ 0.000000] cma: Reserved 64 MiB at 0xfbc00000
> [ 0.000000] Memory policy: Data cache writealloc
> [ 0.000000] Samsung CPU ID: 0xe5422001
> [ 0.000000] On node 0 totalpages: 913407
> [ 0.000000] free_area_init_node: node 0, pgdat c0b42cc0, node_mem_map
> ee3f7000
> [ 0.000000] Normal zone: 1536 pages used for memmap
> [ 0.000000] Normal zone: 0 pages reserved
> [ 0.000000] Normal zone: 194560 pages, LIFO batch:31
> [ 0.000000] HighMem zone: 718847 pages, LIFO batch:31
> [ 0.000000] percpu: Embedded 12 pages/cpu @ee341000 s19392 r8192
> d21568 u49152
> [ 0.000000] pcpu-alloc: s19392 r8192 d21568 u49152 alloc=12*4096
> [ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 [0] 4 [0] 5 [0] 6 [0] 7
> [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on.
> Total pages: 911871
> [ 0.000000] Kernel command line: cros_legacy console=ttySAC3,115200
> debug earlyprintk cros_debug no_console_suspend root=/dev/ram0 rw
> ramdisk=32768 initrd=0x42000000,3
> 2M
I see that you are loading an initrd at 0x42000000 with size of 32 MiB.
[...]
> [ 1.121421] Trying to unpack rootfs image as initramfs...
> [ 1.126940] rootfs image is not initramfs (junk in compressed
> archive); looks like an initrd
> [ 1.160139] Unable to handle kernel paging request at virtual address
> e3000000
So I wonder if the problem is that the memblock_remove() is called very
early and so the kernel is not able to copy the initrd from 0x42000000
to 0x44000000 since overlaps with the mfc-r mem (0x43000000-0x43800000).
Specially since the NULL pointer dereference below happens in the
populate_rootfs() function when calling xwrite() to do the copy.
Could you please try to change the load address for your initrd, or
change the mfc-r start address to see if that prevents the issue?
> [ 1.167270] pgd = c0004000
> [ 1.170046] [e3000000] *pgd=00000000
> [ 1.173693] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
> [ 1.179068] Modules linked in:
> [ 1.182194] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
> 4.6.0-00073-g35e691c #59
> [ 1.189477] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [ 1.195638] task: edc88000 ti: edc76000 task.ti: edc76000
> [ 1.201111] PC is at memcpy+0x48/0x330
> [ 1.204923] LR is at iov_iter_copy_from_user_atomic+0x184/0x24c
> [ 1.210906] pc : [<c0320388>] lr : [<c0331688>] psr: 20000013
> [ 1.210906] sp : edc77cd4 ip : 00000000 fp : c070b640
> [ 1.222530] r10: 00000000 r9 : 00000000 r8 : ffefe000
> [ 1.227822] r7 : 00000000 r6 : ffeff000 r5 : 00001000 r4 : edc77dec
> [ 1.234415] r3 : 01000000 r2 : 00000f80 r1 : e3000000 r0 : ffefe000
> [ 1.241009] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM
> Segment none
> [ 1.248208] Control: 10c5387d Table: 2000406a DAC: 00000051
> [ 1.254020] Process swapper/0 (pid: 1, stack limit = 0xedc76210)
> [ 1.260093] Stack: (0xedc77cd4 to 0xedc78000)
> [ 1.264518] 7cc0:
> 00001000 ffeff000 00000000
> [ 1.272760] 7ce0: ffefe000 ffefe000 edc77dec c0331688 00001000
> 00001000 edc77df4 ed85508c
> [ 1.281001] 7d00: 00001000 01000000 00000000 00000000 c070b640
> c01966d8 00001000 00000001
> [ 1.289242] 7d20: edc77d40 edc77d44 00000000 edf0e600 01000000
> 00000000 edc76000 00000001
> [ 1.297483] 7d40: eff519e0 c01f6100 00000000 00000000 edc77e08
> 00000000 edc77df4 edc77df4
> [ 1.305725] 7d60: edf0e600 ed85508c c0b45050 c0197f88 c0b45050
> c06c9d3c c0b67b58 c0b67b58
> [ 1.313966] 7d80: 000000a8 00000003 ed855018 edc77e08 ed855018
> edf0e600 edc77df4 02000000
> [ 1.322207] 7da0: 00000000 c0b4504c c0b45050 c0198118 eded6860
> c0b4504c c0b45050 c01ec01c
> [ 1.330448] 7dc0: edf0e600 02000000 00000000 00000000 edc77e60
> eded6860 c0b4504c c01dd0b8
> [ 1.338690] 7de0: 02000000 00000301 00000002 e2000000 02000000
> 00000003 01000000 01000000
> [ 1.346931] 7e00: edc77dec 00000001 edf0e600 00000000 00000000
> 00000000 00000000 00000000
> [ 1.355172] 7e20: 00000000 00000000 edf0e600 02000000 e2000000
> edc77e60 00000000 c01dddac
> [ 1.363414] 7e40: ed854fa0 edf0e608 edf0e600 edf0e600 e2000000
> 02000000 00000000 c01dead8
> [ 1.371655] 7e60: 00000000 00000000 c08781c0 02000000 e2000000
> 00000000 00000000 c0a027a8
> [ 1.379896] 7e80: 00000000 00000000 eded6800 c0b43a4c 00000000
> c0a02eb4 c0871494 eded685b
> [ 1.388137] 7ea0: 00000001 00000068 000241ed 00000000 00000000
> 00000000 00001000 00000000
> [ 1.396378] 7ec0: 57465fab 00000000 57465fab 00000000 00000000
> 376eac80 00000000 00000000
> [ 1.404619] 7ee0: 00000000 c0b05a50 c0b05a50 c0a02d70 00000000
> edf24ac0 000000d4 c0a34848
> [ 1.412861] 7f00: 00000000 c0101814 c0b0a98c edc77f18 c0b47668
> c06c98b0 60000000 c0b0933c
> [ 1.421102] 7f20: 00000000 c0b0933c c0926578 c0716b3c 000000d4
> c0135ef0 0000cccd 00000000
> [ 1.429343] 7f40: c08dd0e0 00000000 00000005 00000005 c0b09318
> efffc8c0 c0a5ba5c 00000005
> [ 1.437585] 7f60: c0a3483c c0b45000 c0b45000 000000d4 c0a34848
> c0a00db8 00000005 00000005
> [ 1.445826] 7f80: 00000000 c0a005a0 00000000 c06c6254 00000000
> 00000000 00000000 00000000
> [ 1.454067] 7fa0: 00000000 c06c625c 00000000 c0107a38 00000000
> 00000000 00000000 00000000
> [ 1.462308] 7fc0: 00000000 00000000 00000000 00000000 00000000
> 00000000 00000000 00000000
> [ 1.470549] 7fe0: 00000000 00000000 00000000 00000000 00000013
> 00000000 f7ffffff a7ffefff
> [ 1.478797] [<c0320388>] (memcpy) from [<c0331688>]
> (iov_iter_copy_from_user_atomic+0x184/0x24c)
> [ 1.487646] [<c0331688>] (iov_iter_copy_from_user_atomic) from
> [<c01966d8>] (generic_perform_write+0xf8/0x1c8)
> [ 1.497706] [<c01966d8>] (generic_perform_write) from [<c0197f88>]
> (__generic_file_write_iter+0x198/0x1f4)
> [ 1.507420] [<c0197f88>] (__generic_file_write_iter) from
> [<c0198118>] (generic_file_write_iter+0x134/0x260)
> [ 1.517311] [<c0198118>] (generic_file_write_iter) from [<c01dd0b8>]
> (__vfs_write+0xa8/0xd8)
> [ 1.525811] [<c01dd0b8>] (__vfs_write) from [<c01dddac>]
> (vfs_write+0x90/0x164)
> [ 1.533184] [<c01dddac>] (vfs_write) from [<c01dead8>]
> (SyS_write+0x44/0x9c)
> [ 1.540301] [<c01dead8>] (SyS_write) from [<c0a027a8>] (xwrite+0x2c/0x68)
> [ 1.547152] [<c0a027a8>] (xwrite) from [<c0a02eb4>]
> (populate_rootfs+0x144/0x268)
> [ 1.554700] [<c0a02eb4>] (populate_rootfs) from [<c0101814>]
> (do_one_initcall+0x90/0x1d8)
> [ 1.562939] [<c0101814>] (do_one_initcall) from [<c0a00db8>]
> (kernel_init_freeable+0x15c/0x1fc)
> [ 1.571706] [<c0a00db8>] (kernel_init_freeable) from [<c06c625c>]
> (kernel_init+0x8/0x114)
> [ 1.579945] [<c06c625c>] (kernel_init) from [<c0107a38>]
> (ret_from_fork+0x14/0x3c)
> [ 1.587576] Code: ba000002 f5d1f03c f5d1f05c f5d1f07c (e8b151f8)
> [ 1.593751] ---[ end trace 065c5ae2b4577941 ]---
Best regards,
--
Javier Martinez Canillas
Open Source Group
Samsung Research America
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