最近的一个推断调整nand是好是坏司机+测试程序，因此，与下面的调整过程。看来他也学到了一点知识。因此，关于备案。

这篇文章主要是讲述调式驱动的一个方法而已。

先来看看測试程序

#include <string.h>

#include <errno.h>

#include "dragonboard_inc.h"

#include <sys/ioctl.h>

#include <linux/ioctl.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#include <fcntl.h>

#include <stdio.h>

/* just define an ioctl cmd for nand test*/

#define DRAGON_BOARD_TEST    _IO('V',55)  

int main(int argc, char *argv[])

{

    char filename[256];

    int fd;

    int retval = -1;

    if (argc == 2) {

        strncpy(filename, argv[1], 256);

    }

    else {

        db_error("Usage: nandrw FILE\n");

        retval = -1;

    }

    /* open file */

    fd = open(filename, O_RDWR);

	printf("filename is %s\n",filename);

	printf("nand fd = %d\n",fd);

    if (fd < 0) {

        db_error("can't open %s(%s)\n", filename, strerror(errno));

        retval = -1;

    }

	/* if nand ok,return 0;otherwise,return -1 */

	retval = ioctl(fd, DRAGON_BOARD_TEST);

	printf("ioctl_retval = %d\n",retval);

	if (retval < 0) {

        db_error("error in ioctl(%s)......\n", strerror(errno));

				return retval;

    }

    /* TEST OK */

    return retval;

}

測试用例非常easy。先打开/dev/nanda的设备节点，用于返回fd给ioctl用。 ioctl里的cmd = DRAGON_BOARD_TEST。这是底层实现。

ioctl调用完了就返回，假设返回0表示nand是好的，否则表示nand是坏的。底层怎样实现。我就不细说了。

这里须要提的是，測试用例并没有主动调用close(fd)。可是。可是，可是。你万万不要忘了。系统是会自己主动回收的，系统会帮你调用close函数。

于是有了以下这个bug 的log信息：

[    7.947228] Unable to handle kernel paging request at virtual address ed9f4b00

[    7.956339] pgd = d78a8000

[    7.956876] [ed9f4b00] *pgd=00000000

[    7.956876] Internal error: Oops: 80000005 [#1] PREEMPT SMP ARM

[    7.956876] Modules linked in: sunxi_keyboard ft5x_ts nand(O) lcd disp

[    7.956876] CPU: 0    Tainted: G           O  (3.4.39 #21)

[    7.956876] PC is at 0xed9f4b00

[    7.956876] LR is at nand_blk_release+0x24/0x28 [nand]

[    7.956876] pc : [<ed9f4b00>]    lr : [<bf116ed4>]    psr: a0000033

[    7.956876] sp : d76abe08  ip : d76abe18  fp : d76abe14

[    7.956876] r10: d7dc5998  r9 : d7740a90  r8 : d7c02650

[    7.956876] r7 : d7854000  r6 : 0000001f  r5 : bf11719c  r4 : bf14b828

[    7.956876] r3 : ed9f4b01  r2 : d76abe00  r1 : 0000ffff  r0 : d7854400

[    7.956876] Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA Thumb  Segment user

[    7.956876] Control: 10c5387d  Table: 578a806a  DAC: 00000015

[    7.956876]

[    7.956876] PC: 0xed9f4a80:

[    7.956876] 4a80  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4aa0  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4ac0  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4ae0  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4b00  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4b20  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4b40  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4b60  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876]

[    7.956876] SP: 0xd76abd88:

[    7.956876] bd88  c09a7b40 c0e769e4 d76abdb4 d76abda0 c0062dec c0085640 ed9f4b00 a0000033

[    7.956876] bda8  ffffffff d76abdf4 d76abe14 d76abdc0 c0010438 c000a25c d7854400 0000ffff

[    7.956876] bdc8  d76abe00 ed9f4b01 bf14b828 bf11719c 0000001f d7854000 d7c02650 d7740a90

[    7.956876] bde8  d7dc5998 d76abe14 d76abe18 d76abe08 bf116ed4 ed9f4b00 a0000033 ffffffff

[    7.956876] be08  d76abe2c d76abe18 bf1171c8 bf116ebc bf14b7f8 d7c02640 d76abe5c d76abe30

[    7.956876] be28  c0134da0 bf1171a8 d7c027a0 d7c02640 0000001f d7c02650 d7776688 00000000

[    7.956876] be48  d7740a90 d7dc5998 d76abe7c d76abe60 c0134f5c c0134ce0 d7776680 d780f070

[    7.956876] be68  00000008 d7776688 d76abe8c d76abe80 c0134f94 c0134e44 d76abec4 d76abe90

[    7.956876]

[    7.956876] IP: 0xd76abd98:

[    7.956876] bd98  c0062dec c0085640 ed9f4b00 a0000033 ffffffff d76abdf4 d76abe14 d76abdc0

[    7.956876] bdb8  c0010438 c000a25c d7854400 0000ffff d76abe00 ed9f4b01 bf14b828 bf11719c

[    7.956876] bdd8  0000001f d7854000 d7c02650 d7740a90 d7dc5998 d76abe14 d76abe18 d76abe08

[    7.956876] bdf8  bf116ed4 ed9f4b00 a0000033 ffffffff d76abe2c d76abe18 bf1171c8 bf116ebc

[    7.956876] be18  bf14b7f8 d7c02640 d76abe5c d76abe30 c0134da0 bf1171a8 d7c027a0 d7c02640

[    7.956876] be38  0000001f d7c02650 d7776688 00000000 d7740a90 d7dc5998 d76abe7c d76abe60

[    7.956876] be58  c0134f5c c0134ce0 d7776680 d780f070 00000008 d7776688 d76abe8c d76abe80

[    7.956876] be78  c0134f94 c0134e44 d76abec4 d76abe90 c01045a8 c0134f78 00000000 00000000

[    7.956876]

[    7.956876] FP: 0xd76abd94:

[    7.956876] bd94  d76abda0 c0062dec c0085640 ed9f4b00 a0000033 ffffffff d76abdf4 d76abe14

[    7.956876] bdb4  d76abdc0 c0010438 c000a25c d7854400 0000ffff d76abe00 ed9f4b01 bf14b828

[    7.956876] bdd4  bf11719c 0000001f d7854000 d7c02650 d7740a90 d7dc5998 d76abe14 d76abe18

[    7.956876] bdf4  d76abe08 bf116ed4 ed9f4b00 a0000033 ffffffff d76abe2c d76abe18 bf1171c8

[    7.956876] be14  bf116ebc bf14b7f8 d7c02640 d76abe5c d76abe30 c0134da0 bf1171a8 d7c027a0

[    7.956876] be34  d7c02640 0000001f d7c02650 d7776688 00000000 d7740a90 d7dc5998 d76abe7c

[    7.956876] be54  d76abe60 c0134f5c c0134ce0 d7776680 d780f070 00000008 d7776688 d76abe8c

[    7.956876] be74  d76abe80 c0134f94 c0134e44 d76abec4 d76abe90 c01045a8 c0134f78 00000000

[    7.956876]

[    7.956876] R0: 0xd7854380:

[    7.956876] 4380  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[    7.956876] 43a0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[    7.956876] 43c0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[    7.956876] 43e0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[    7.956876] 4400  bf14b828 ee367b0e ee205b07 ee376b02 eeb5cb05 ee311bc0 eef18b06 ee0efa10

[    7.956876] 4420  bf48cb0e 5b41eeb1 eeb0d401 eeb55b41 eef16bc0 bf48fa10 7b46eeb1 eeb0d401

[    7.956876] 4440  eeb47b46 eef15bc7 f301fa10 ee36839e 4bda7b48 ed93447b ee316b00 ed9d7b07

[    7.956876] 4460  ee371b02 ee317b06 ee399b07 ed9f4b08 4bd37bc0 ed93447b ee201b00 ee246b07

[    7.956876]

[    7.956876] R2: 0xd76abd80:

[    7.956876] bd80  00000000 c00d09b4 c09a7b40 c0e769e4 d76abdb4 d76abda0 c0062dec c0085640

[    7.956876] bda0  ed9f4b00 a0000033 ffffffff d76abdf4 d76abe14 d76abdc0 c0010438 c000a25c

[    7.956876] bdc0  d7854400 0000ffff d76abe00 ed9f4b01 bf14b828 bf11719c 0000001f d7854000

[    7.956876] bde0  d7c02650 d7740a90 d7dc5998 d76abe14 d76abe18 d76abe08 bf116ed4 ed9f4b00

[    7.956876] be00  a0000033 ffffffff d76abe2c d76abe18 bf1171c8 bf116ebc bf14b7f8 d7c02640

[    7.956876] be20  d76abe5c d76abe30 c0134da0 bf1171a8 d7c027a0 d7c02640 0000001f d7c02650

[    7.956876] be40  d7776688 00000000 d7740a90 d7dc5998 d76abe7c d76abe60 c0134f5c c0134ce0

[    7.956876] be60  d7776680 d780f070 00000008 d7776688 d76abe8c d76abe80 c0134f94 c0134e44

[    7.956876]

[    7.956876] R3: 0xed9f4a81:

[    7.956876] 4a80  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4aa0  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4ac0  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4ae0  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4b00  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4b20  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4b40  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4b60  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876] 4b80  ******** ******** ******** ******** ******** ******** ******** ********

[    7.956876]

[    7.956876] R7: 0xd7853f80:

[    7.956876] 3f80  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[    7.956876] 3fa0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[    7.956876] 3fc0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[    7.956876] 3fe0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[    7.956876] 4000  0000005d 00000000 00000001 646e616e 00000061 00000000 00000000 00000000

[    7.956876] 4020  00000000 00000000 00000000 00000000 00000000 00000000 d777c880 00000000

[    7.956876] 4040  00000000 00000000 00000200 00000000 00000000 00000000 00000000 00000000

[    7.956876] 4060  00000000 d79e4f40 d777c640 d776a22c d79e5e0c d81b3b40 d80c3d00 c097e5c8

[    7.956876]

[    7.956876] R8: 0xd7c025d0:

[    7.956876] 25d0  00000000 00000000 d7c025d8 d7c025d8 00000000 00000000 00000000 c06496fc

[    7.956876] 25f0  000200d0 d7761b70 00000000 00000000 d7c02600 d7c02600 00000000 d7c0260c

[    7.956876] 2610  d7c0260c d7c02440 00000000 00000000 00000000 00000000 00000000 00000000

[    7.956876] 2630  00000000 00000000 00000000 00000000 05d00000 00000000 d7c026d0 00000000

[    7.956876] 2650  00000000 00000000 00000000 d7c0265c d7c0265c d78e73c0 d780f1ac d780f1ac

[    7.956876] 2670  00000000 00000000 00000000 00000000 d7c02680 d7c02680 d7c02640 00001000

[    7.956876] 2690  d7854040 00000000 00000000 d7854000 d760c078 d7c02aa4 c096d70c 00000000

[    7.956876] 26b0  00000000 00000001 00000000 00000000 d7c026c0 d7c026c0 00000000 00000000

[    7.956876]

[    7.956876] R9: 0xd7740a10:

[    7.956876] 0a10  d7740a10 d7740a10 d7740a18 d7740a18 d7740a20 d7740a20 00000000 d800ba40

[    7.956876] 0a30  00000000 00000000 00000017 00000000 00000000 00000000 00000000 00000000

[    7.956876] 0a50  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[    7.956876] 0a70  00000000 00000000 00000000 00000000 d801fd00 d801fd00 d8021380 d7d26aa8

[    7.956876] 0a90  d7c01f70 d810dc00 00000020 c0940774 00000001 d7740cec d7740cec d80212ec

[    7.956876] 0ab0  d7740dac d810dc8c d7740f34 d781aec0 d7740d00 d7740dc0 d7740ac8 d7740ac8

[    7.956876] 0ad0  d7740ad0 d7740ad0 d7740ad8 d7740ad8 d7740ae0 d7740ae0 00000000 d800ba40

[    7.956876] 0af0  00000000 00000000 00000014 00000000 00000000 00000000 00000000 00000000

[    7.956876]

[    7.956876] R10: 0xd7dc5918:

[    7.956876] 5918  d7cda1a8 c12872e0 d7dc52b0 bf51d0bd 0000000f d7dc5934 d7e0ce58 74736574

[    7.956876] 5938  6e6f635f 2e676966 00786566 00000000 00000000 00000000 00000000 00000000

[    7.956876] 5958  00000000 00000000 00000000 c0652fc0 d782fc00 00000002 00000000 d782fc94

[    7.956876] 5978  d782fc94 d7dc5324 d7dc5324 d7dc5984 d7dc5984 d7e0cefc d7e0cefc 00000000

[    7.956876] 5998  00000088 00000004 00000000 c128ba94 d7c01f70 12770052 00000005 d7dc59bc

[    7.956876] 59b8  d780f070 646e616e 00000061 00000000 00000000 00000000 00000000 00000000

[    7.956876] 59d8  00000000 00000000 00000002 00000000 00000000 c0648a40 d810dc00 00000000

[    7.956876] 59f8  00000000 d7dc59fc d7dc59fc d7d2a20c d7d23d34 d7dc5a0c d7dc5a0c d780f114

[    7.956876] Process nandrw (pid: 159, stack limit = 0xd76aa2f8)

[    7.956876] Stack: (0xd76abe08 to 0xd76ac000)

[    7.956876] be00:                   d76abe2c d76abe18 bf1171c8 bf116ebc bf14b7f8 d7c02640

[    7.956876] be20: d76abe5c d76abe30 c0134da0 bf1171a8 d7c027a0 d7c02640 0000001f d7c02650

[    7.956876] be40: d7776688 00000000 d7740a90 d7dc5998 d76abe7c d76abe60 c0134f5c c0134ce0

[    7.956876] be60: d7776680 d780f070 00000008 d7776688 d76abe8c d76abe80 c0134f94 c0134e44

[    7.956876] be80: d76abec4 d76abe90 c01045a8 c0134f78 00000000 00000000 d76abec4 d7776680

[    7.956876] bea0: 00000000 d8038380 d8038388 00000028 d76aa000 00000000 d76abee4 d76abec8

[    7.956876] bec0: c0100dc4 c0104494 d80383fc d8038380 00000000 00000001 d76abf0c d76abee8

[    7.956876] bee0: c00397cc c0100d50 d78e73c0 d8038380 d78e7680 000000f8 c00109e8 00000000

[    7.956876] bf00: d76abf2c d76abf10 c00398c0 c0039738 00800000 d78e73c0 00000000 d76aa000

[    7.956876] bf20: d76abf74 d76abf30 c0039b80 c0039884 d76abf6c 00000001 c0102b08 c013ae84

[    7.956876] bf40: 00000000 00000000 d76abf64 d793eb80 00000000 d76aa000 000000f8 c00109e8

[    7.956876] bf60: d76aa000 00000000 d76abf94 d76abf78 c003a384 c00398d0 000a27f0 b6fc475c

[    7.956876] bf80: 00000000 000000f8 d76abfa4 d76abf98 c003a3d0 c003a2f8 00000000 d76abfa8

[    7.956876] bfa0: c0010780 c003a3bc 000a27f0 b6fc475c 00000000 000a27dc ffffffff 00000000

[    7.956876] bfc0: 000a27f0 b6fc475c 00000000 000000f8 b6fc6000 00000000 b6fc6000 00000000

[    7.956876] bfe0: b6fee000 bede1b48 b6eb6494 b6f23964 60000010 00000000 587c1821 587c1c21

[    7.956876] [<bf116ed4>] (nand_blk_release+0x24/0x28 [nand]) from [<bf1171c8>] (nand_release+0x2c/0x44 [nand])

[    7.956876] [<bf1171c8>] (nand_release+0x2c/0x44 [nand]) from [<c0134da0>] (__blkdev_put+0xcc/0x164)

[    7.956876] [<c0134da0>] (__blkdev_put+0xcc/0x164) from [<c0134f5c>] (blkdev_put+0x124/0x134)

[    7.956876] [<c0134f5c>] (blkdev_put+0x124/0x134) from [<c0134f94>] (blkdev_close+0x28/0x2c)

[    7.956876] [<c0134f94>] (blkdev_close+0x28/0x2c) from [<c01045a8>] (fput+0x120/0x228)

[    7.956876] [<c01045a8>] (fput+0x120/0x228) from [<c0100dc4>] (filp_close+0x80/0x8c)

[    7.956876] [<c0100dc4>] (filp_close+0x80/0x8c) from [<c00397cc>] (put_files_struct+0xa0/0xfc)

[    7.956876] [<c00397cc>] (put_files_struct+0xa0/0xfc) from [<c00398c0>] (exit_files+0x48/0x4c)

[    7.956876] [<c00398c0>] (exit_files+0x48/0x4c) from [<c0039b80>] (do_exit+0x2bc/0x7d0)

[    7.956876] [<c0039b80>] (do_exit+0x2bc/0x7d0) from [<c003a384>] (do_group_exit+0x98/0xc4)

[    7.956876] [<c003a384>] (do_group_exit+0x98/0xc4) from [<c003a3d0>] (__wake_up_parent+0x0/0x30)

[    7.956876] [<c003a3d0>] (__wake_up_parent+0x0/0x30) from [<c0010780>] (ret_fast_syscall+0x0/0x30)

[    7.956876] Code: bad PC value

[    9.177219] ---[ end trace b1efa7b6baf6b056 ]---

[    9.182375] Fixing recursive fault but reboot is needed!

从上面的log能够看出是调用nand_blk_release函数的时候出错了。为什么会出错，pc指针的操作错误。从而证明了，即使没有主动调用close函数，系统也会在自己主动回收资源的时候，帮你调用close函数。

重点要说的是，调式方法：

1.先找到nand_blk_release是在哪个文件编译出来的，比方：我的是nand_blk.c

2.arm-none-linux-gnueabi-objdump -S nand_blk.o > ~/nand.S

3.分析nand.S。它是一个C语言+汇编的文件，比分析全汇编的文件方便多了。

这里就不具体分析nand.S了。由于这貌似涉及到公司秘密问题。

版权声明：本文博主原创文章，博客，未经同意不得转载。

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