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s5pv210 设备树启动失败解决办法

分类： 嵌入式

2015-09-24 00:41:13

## Current stack ends at 0x4fcc8c00 *  kernel: cmdline image address = 0x30000000
## Booting kernel from Legacy Image at 30000000 ...
   Image Name:   Linux-3.17.2
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1427952 Bytes = 1.4 MiB
   Load Address: 30008000
   Entry Point:  30008000
   Verifying Checksum ... OK
   kernel data at 0x30000040, len = 0x0015c9f0 (1427952)
## Flattened Device Tree blob at 38000000
   Booting using the fdt blob at 0x38000000
   Loading Kernel Image ... OK
   kernel loaded at 0x30008000, end = 0x301649f0
images.os.start = 0x30000000, images.os.end = 0x3015ca30
images.os.load = 0x30008000, load_end = 0x301649f0
using: FDT
   Loading Device Tree to 4fcbe000, end 4fcc74f5 ... OK
## Transferring control to Linux (at address 30008000)...


Starting kernel ...


Uncompressing Linux... done, booting the kernel.
__atags_pointer is 4FCBE000
Now setup_machine_fdt
phys_to_virt(dt_phys) is 9FCBE000
setup_machine_fdt stop! return NULL
no return
_machine_arch_type = Samsung S5PC110/S5PV210-based board
Booting Linux on physical CPU 0x0
Linux version 3.17.2 (tom@tom-virtual-machine) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #17 PREEMPT Thu Sep 24 00:08:00 CST 2015
CPU: ARMv7 Processor [412fc082] revision 2 (ARMv7), cr=10c5387d
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
__atags_pointer is 4FCBE000
Now setup_machine_fdt
phys_to_virt(dt_phys) is 9FCBE000
setup_machine_fdt stop! return NULL
no return
Machine model: YIC System SMDKV210 based on S5PV210
_machine_arch_type = Samsung S5PC110/S5PV210-based board
debug: ignoring loglevel setting.
bootconsole [earlycon0] enabled
Memory policy: Data cache writeback
On node 0 totalpages: 131072
free_area_init_node: node 0, pgdat 802b3f84, node_mem_map 9f8be000
  Normal zone: 1024 pages used for memmap
  Normal zone: 0 pages reserved
  Normal zone: 131072 pages, LIFO batch:31
CPU: All CPU(s) started in SVC mode.
pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
pcpu-alloc: [0] 0 
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 130048
Kernel command line: noinitrd root=/dev/mtdblock5 rootfstype=yaffs2 init=/linuxrc console=ttySAC0,115200n8 rw rootwait ignore_loglevel earlyprintk mem=512M
PID hash table entries: 2048 (order: 1, 8192 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 516652K/524288K available (1851K kernel code, 153K rwdata, 600K rodata, 127K init, 205K bss, 7636K reserved)
Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xffc00000 - 0xffe00000   (2048 kB)
    vmalloc : 0xa0800000 - 0xff000000   (1512 MB)
    lowmem  : 0x80000000 - 0xa0000000   ( 512 MB)
    modules : 0x7f000000 - 0x80000000   (  16 MB)
      .text : 0x80008000 - 0x8026cf64   (2452 kB)
      .init : 0x8026d000 - 0x8028cfc4   ( 128 kB)
      .data : 0x8028e000 - 0x802b46c0   ( 154 kB)
       .bss : 0x802b46c0 - 0x802e7db4   ( 206 kB)
SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Preemptible hierarchical RCU implementation.
NR_IRQS:16 nr_irqs:16 16
VIC @a0800000: id 0x00041192, vendor 0x41
VIC @a0802000: id 0x00041192, vendor 0x41
VIC @a0804000: id 0x00041192, vendor 0x41
VIC @a0806000: id 0x00041192, vendor 0x41
S5PV210 clocks: mout_apll = 0, mout_mpll = 0
        mout_epll = 0, mout_vpll = 0
Kernel panic - not syncing: failed to get timers clock for timer
CPU: 0 PID: 0 Comm: swapper Not tainted 3.17.2 #17
[<800126c8>] (unwind_backtrace) from [<800108fc>] (show_stack+0x10/0x14)
[<800108fc>] (show_stack) from [<801bc53c>] (panic+0x8c/0x1ec)
[<801bc53c>] (panic) from [<80281e54>] (samsung_pwm_alloc+0x104/0x12c)
[<80281e54>] (samsung_pwm_alloc) from [<80281a8c>] (clocksource_of_init+0x48/0x8c)
[<80281a8c>] (clocksource_of_init) from [<8026da1c>] (start_kernel+0x214/0x37c)
[<8026da1c>] (start_kernel) from [<30008070>] (0x30008070)
---[ end Kernel panic - not syncing: failed to get timers clock for timer


删掉pwm的设备节点会提示clocksource_of_init: no matching clocksources found，参考文章
style="color:#000000;">

说明pwm不能删掉，timers一定要初始化，但是新内核中没有timers这个时钟名，只能分析添加了。三星是怎么活下来的？
clocksource_of_init在drivers/clocksource/clksrc-of.c中定义，drivers/clocksource/samsung_pwm_timer.c中进行pwm的of什么和初始化。
关键是pwm.timerclk = of_clk_get_by_name(np, "timers");这里要寻找timers，不能找得到的，drv/clk/samsung/clk-s5pv210.c并没有定义这个时钟。
旧内核中的定义mach-s5pv210/clock.c：


}, {
.name = "timers",
.parent = &clk_pclk_psys.clk,
.enable = s5pv210_clk_ip3_ctrl,
.ctrlbit = (1<<23),

对比systimer
}, {
.name = "systimer",
.parent = &clk_pclk_psys.clk,
.enable = s5pv210_clk_ip3_ctrl,
.ctrlbit = (1<<16),

再看新内核中有
GATE(CLK_PWM, "pwm", "dout_pclkp", CLK_GATE_IP3, 23, 0, 0),
应该就是这个了，在设备树中改名字试试，最后证明，改名没用。
最后卡在

点击(此处)折叠或打开

  1. pwm.timerclk = of_clk_get_by_name(np, "timers");//    pwm.timerclk = of_clk_get_by_name(np, "timers"); modify by richard
  2.     if (IS_ERR(pwm.timerclk))
  3.         panic("failed to get timers clock for timer");

  5.     _samsung_pwm_clocksource_init();
继续跟踪发现它要获取pwm时钟，但是pwm的clocks = <&clocks CLK_PWM>;
这个啥意思还看不懂。

点击(此处)折叠或打开

  1. pwm: pwm@e2500000 {
  2.             compatible = "samsung,s5pc100-pwm";
  3.             reg = <0xe2500000 0x1000>;
  4.             interrupt-parent = <&vic0>;
  5.             interrupts = <21>, <22>, <23>, <24>, <25>;
  6.             clock-names = "timers";/*clock-names = "timers";*/
  7.             clocks = <&clocks CLK_PWM>;
  8.             #pwm-cells = <3>;
  9.         };
添加打印信息，结果显示：

点击(此处)折叠或打开

  1. Linux version 3.17.2 (tom@tom-virtual-machine) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #29 PREEMPT Thu Sep 24 04:17:31 CST 2015
  2. CPU: ARMv7 Processor [412fc082] revision 2 (ARMv7), cr=10c5387d
  3. CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
  4. __atags_pointer is 4FCBE000
  5. Now setup_machine_fdt
  6. phys_to_virt(dt_phys) is 9FCBE000
  7. setup_machine_fdt return NULL
  8. no return
  9. Machine model: YIC System SMDKV210 based on S5PV210
  10. _machine_arch_type = Samsung S5PC110/S5PV210-based board
  11. debug: ignoring loglevel setting.
  12. bootconsole [earlycon0] enabled
  13. Memory policy: Data cache writeback
  14. On node 0 totalpages: 131072
  15. free_area_init_node: node 0, pgdat 802b3f84, node_mem_map 9f8be000
  16.   Normal zone: 1024 pages used for memmap
  17.   Normal zone: 0 pages reserved
  18.   Normal zone: 131072 pages, LIFO batch:31
  19. CPU: All CPU(s) started in SVC mode.
  20. pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
  21. pcpu-alloc: [0] 0
  22. Built 1 zonelists in Zone order, mobility grouping on. Total pages: 130048
  23. Kernel command line: noinitrd root=/dev/mtdblock5 rootfstype=yaffs2 init=/linuxrc console=ttySAC0,115200n8 rw rootwait ignore_loglevel earlyprintk mem=512M
  24. PID hash table entries: 2048 (order: 1, 8192 bytes)
  25. Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
  26. Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
  27. Memory: 516652K/524288K available (1851K kernel code, 153K rwdata, 600K rodata, 127K init, 205K bss, 7636K reserved)
  28. Virtual kernel memory layout:
  29.     vector : 0xffff0000 - 0xffff1000 ( 4 kB)
  30.     fixmap : 0xffc00000 - 0xffe00000 (2048 kB)
  31.     vmalloc : 0xa0800000 - 0xff000000 (1512 MB)
  32.     lowmem : 0x80000000 - 0xa0000000 ( 512 MB)
  33.     modules : 0x7f000000 - 0x80000000 ( 16 MB)
  34.       .text : 0x80008000 - 0x8026cf64 (2452 kB)
  35.       .init : 0x8026d000 - 0x8028cfe4 ( 128 kB)
  36.       .data : 0x8028e000 - 0x802b46c0 ( 154 kB)
  37.        .bss : 0x802b46c0 - 0x802e7db4 ( 206 kB)
  38. SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
  39. Preemptible hierarchical RCU implementation.
  40. NR_IRQS:16 nr_irqs:16 16
  41. VIC @a0800000: id 0x00041192, vendor 0x41
  42. VIC @a0802000: id 0x00041192, vendor 0x41
  43. VIC @a0804000: id 0x00041192, vendor 0x41
  44. VIC @a0806000: id 0x00041192, vendor 0x41
  45. S5PV210 clocks: mout_apll = 1000000000, mout_mpll = 667000000
  46.         mout_epll = 96000000, mout_vpll = 54000000
  47. of_clk_get_by_name timers
  48. name && index >= 0, 0xfffffdfb
  49. of_clk_get_by_name timers failed
  50. Unable to handle kernel paging request at virtual address fffffe33
  51. pgd = 80004000
  52. [fffffe33] *pgd=4fffd821, *pte=00000000, *ppte=00000000
  53. Internal error: Oops: 17 [#1] PREEMPT ARM
  54. Modules linked in:
  55. CPU: 0 PID: 0 Comm: swapper Not tainted 3.17.2 #29
  56. task: 80296770 ti: 8028e000 task.ti: 8028e000
  57. PC is at __clk_prepare+0x10/0x74
  58. LR is at clk_prepare+0x14/0x24
  59. pc : [<801b32d8>] lr : [<801b3870>] psr: a00001d3
  60. sp : 8028ff60 ip : 00000000 fp : 00000000
  61. r10: 00000000 r9 : 412fc082 r8 : 9fff1088
  62. r7 : 00000001 r6 : 9fff1260 r5 : 8028ff8c r4 : fffffdfb
  63. r3 : 80296770 r2 : 00000001 r1 : 00000017 r0 : fffffdfb
  64. Flags: NzCv IRQs off FIQs off Mode SVC_32 ISA ARM Segment kernel
  65. Control: 10c5387d Table: 30004019 DAC: 00000015
  66. Process swapper (pid: 0, stack limit = 0x8028e238)
  67. Stack: (0x8028ff60 to 0x80290000)
  68. ff60: 80296770 fffffdfb 8028ff8c 801b3870 fffffdfb 80281b28 802e7b48 8028ff8c
  69. ff80: 9fff1260 80281e60 9fff1088 00000003 a00001d3 8028ffb4 00000001 9fff1088
  70. ffa0: 80286568 9fffcbc0 00000000 80281a8c 412fc082 8028c210 00000000 ffffffff
  71. ffc0: 802b46c0 8026da1c ffffffff ffffffff 8026d5e4 00000000 00000000 80286568
  72. ffe0: 802b4894 802960b0 80286564 802978a4 30004059 30008070 00000000 00000000
  73. [<801b32d8>] (__clk_prepare) from [<801b3870>] (clk_prepare+0x14/0x24)
  74. [<801b3870>] (clk_prepare) from [<80281b28>] (_samsung_pwm_clocksource_init+0x58/0x280)
  75. [<80281b28>] (_samsung_pwm_clocksource_init) from [<80281e60>] (samsung_pwm_alloc+0x110/0x138)
  76. [<80281e60>] (samsung_pwm_alloc) from [<80281a8c>] (clocksource_of_init+0x48/0x8c)
  77. [<80281a8c>] (clocksource_of_init) from [<8026da1c>] (start_kernel+0x214/0x37c)
  78. [<8026da1c>] (start_kernel) from [<30008070>] (0x30008070)
  79. Code: e92d4038 e2504000 01a05004 0a000005 (e5943038)
  80. ---[ end trace cb88537fdc8fa200 ]---
  81. Kernel panic - not syncing: Attempted to kill the idle
  82. ---[ end Kernel panic - not syncing: Attempted to kill the idle

明显是内存分配出错了，还要继续查。

2015.9.26 昨天下载了4.2.1内核居然可以跑了，肯定是以前的有内核有bug，去kernel.org查看4.2.1的changelog，搜索s5pv210，果然：
commit cd26539f1233da20113eaab88a1b18775ed6dd04
Author: Marek Szyprowski <m.szyprowski@samsung.com>
Date:   Wed Aug 12 10:58:22 2015 +0200

commit cd26539f1233da20113eaab88a1b18775ed6dd04
Author: Marek Szyprowski <m.szyprowski@samsung.com>
Date:   Wed Aug 12 10:58:22 2015 +0200


    clk: s5pv210: add missing call to samsung_clk_of_add_provider()
    
    commit ba30011577330b7e29ecb5916d89c6db9fbc5b3d upstream.
    
    Commit d5e136a21b2028fb1f45143ea7112d5869bfc6c7 ("clk: samsung: Register
    clk provider only after registering its all clocks", merged to v3.17-rc1)
    modified a way that driver registers registers to core framework. This
    change has not been applied to s5pv210 clocks driver, which has been
    merged in parallel to that commit. This patch adds a missing call to
    samsung_clk_of_add_provider(), so the driver is operational again.
    
    Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
    Acked-by: Tomasz Figa <tomasz.figa@gmail.com>
    Signed-off-by: Michael Turquette <mturquette@baylibre.com>





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