am335x nand fpga调试

芯片是AM3358，通过GPMC接口访问nand和FPGA。访问nand使用

{"gpmc_ad0.gpmc_ad0", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad1.gpmc_ad1", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad2.gpmc_ad2", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad3.gpmc_ad3", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad4.gpmc_ad4", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad5.gpmc_ad5", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad6.gpmc_ad6", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad7.gpmc_ad7", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},

访问fapa使用

{"gpmc_ad0.gpmc_ad0", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad1.gpmc_ad1", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad2.gpmc_ad2", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad3.gpmc_ad3", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad4.gpmc_ad4", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad5.gpmc_ad5", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad6.gpmc_ad6", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad7.gpmc_ad7", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},

{"lcd_data0.gpmc_a0", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT|AM33XX_PULL_DISA},
{"lcd_data1.gpmc_a1", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT|AM33XX_PULL_DISA},
{"lcd_data2.gpmc_a2", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT|AM33XX_PULL_DISA},
{"lcd_data3.gpmc_a3", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT|AM33XX_PULL_DISA},
{"lcd_data4.gpmc_a4", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT|AM33XX_PULL_DISA},
{"lcd_data5.gpmc_a5", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT|AM33XX_PULL_DISA},
{"lcd_data6.gpmc_a6", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT|AM33XX_PULL_DISA},
{"lcd_data7.gpmc_a7", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT|AM33XX_PULL_DISA},

开始程序在SD卡中调试，没有使用nand。

在uboot下

insmode fpga.ko  //加载驱动

./fpga_test//执行应用程序

没有问题，可以正常访问FPGA

现在将fpga.ko 和fpga_test放到文件系统中，利用mkfs.ubifs和ubinize压缩。

通过SD卡将：MLO u-boot.img uImage ubi.img烧写到nand中

进入uboot

cd /app                       ;faga.ko faga_test所在路径

insmode fpga.ko      ；加载fpga.ko驱动

执行到这一步，串口输出好多错误，如下

am335x-evm login: root
root@am335x-evm:~# cd /app/
root@am335x-evm:/app# insmod fpga.ko 
[ 2241.860259] Disabling lock debugging due to kernel taint
[ 2241.866555] GPMC revision 6.0
[ 2241.869663] Got CS1, address = 1000000
[ 2241.873695] fpga_base d1000000
root@am335x-evm:/app# [ 2243.576425] Unhandled fault: external abort on non-linefetch (0x1008) at 0xd083a000
[ 2243.584434] Internal error: : 1008 [#1]
[ 2243.588430] Modules linked in: fpga(O)
[ 2243.592354] CPU: 0 Tainted: G W O (3.2.0 #19)
[ 2243.598001] PC is at nand_read_byte+0x14/0x20
[ 2243.602544] LR is at nand_check_wp+0x48/0x58
[ 2243.606996] pc : [<c024d8d0>] lr : [<c024db4c>] psr: 60000013
[ 2243.607003] sp : cfaefcf8 ip : cfaefd08 fp : cfaefd04
[ 2243.618969] r10: 000007ff r9 : 00000000 r8 : 03926800
[ 2243.624414] r7 : cf9a4a28 r6 : 00000800 r5 : cf9a4810 r4 : cf9a4a28
[ 2243.631219] r3 : d083a000 r2 : 00000081 r1 : ffffffff r0 : cf9a4810
[ 2243.638027] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
[ 2243.645647] Control: 10c5387d Table: 8f180019 DAC: 00000015
[ 2243.651638] Process ubifs_bgt0_0 (pid: 709, stack limit = 0xcfaee2f0)
[ 2243.658353] Stack: (0xcfaefcf8 to 0xcfaf0000)
[ 2243.662894] fce0: cfaefd1c cfaefd08
[ 2243.671425] fd00: c024db4c c024d8c8 cfaefd98 cf9a4810 cfaefd8c cfaefd20 c0251420 c024db10
[ 2243.679956] fd20: 00000000 00000001 bafffffd 60000013 00000000 00000000 00000000 00000000
[ 2243.688486] fd40: cfaeb800 000003b6 cfaefd74 00000040 e9ba7fad cfaeb800 03926800 00000000
[ 2243.697017] fd60: 00000000 cf9a4810 00000800 03926800 00000000 00000000 cfaeb800 000003b6
[ 2243.705548] fd80: cfaefdd4 cfaefd90 c0251890 c0251354 cfaefd98 ee4abfd2 00000000 00000800
[ 2243.714078] fda0: 00000000 e9ba7fad b19feba7 a5fefcaf cfaeb800 00000000 00780000 00000000
[ 2243.722609] fdc0: 031a7000 00000000 cfaefe04 cfaefdd8 c0244d6c c0251810 00000800 cfaefe1c
[ 2243.731140] fde0: cfaeb800 cf195c80 00006800 0000018d cfaefe1c 00000800 cfaefe3c cfaefe08
[ 2243.739671] fe00: c026504c c0244d0c 00000800 cfaefe1c cfaeb800 cfaefe20 c0376994 c037726c
[ 2243.748202] fe20: cf9a4000 0000018d 00005800 00000800 cfaefedc cfaefe40 c0263370 c0265000
[ 2243.756733] fe40: 00000800 fb8fefee ba375ddb cfc0ffff d7dfff7f 5ff954c7 fff7fbb9 fddbddbf
[ 2243.765264] fe60: 7b9b4bff cff37fdf de7eb957 bfad39e7 afcffbbf fddfee4f bff73bf7 b5fffd7f
[ 2243.773795] fe80: ff77bf45 7eee77fe 6edf7f53 fd676d5b acf9edf9 77fabfff a7f3a2ff dbbbfebc
[ 2243.782326] fea0: ff9b279b f8af1faf 0000169f 00000000 3f5f1bf1 000003b6 cfaeb800 00000800
[ 2243.790856] fec0: 00000002 00000080 00000000 cfaa6358 cfaeff14 cfaefee0 c02625bc c02632f8
[ 2243.799387] fee0: 00005800 00000800 00000002 c0036f0c c0038fa0 cfaae000 cfaae000 000003b6
[ 2243.807919] ff00: 00005800 00000800 cfaeff4c cfaeff18 c017418c c02624c8 00000800 00000002
[ 2243.816450] ff20: cfaeff4c cfaeff30 c01746e8 cfaa6330 cfaae000 00000800 000007c0 00000002
[ 2243.824982] ff40: cfaeff74 cfaeff50 c01749b4 c0174140 00000800 00000002 cfaae000 00000001
[ 2243.833513] ff60: cfaa6330 00000130 cfaeff9c cfaeff78 c0174ba8 c0174930 cfaae000 cfaee000
[ 2243.842043] ff80: 00000001 cfaae18c 00000000 00000000 cfaeffbc cfaeffa0 c017d148 c0174ae4
[ 2243.850574] ffa0: cf81dd58 cfaae000 c017d0b4 00000013 cfaefff4 cfaeffc0 c0055d48 c017d0c0
[ 2243.859104] ffc0: cf81dd58 00000000 cfaae000 00000000 cfaeffd0 cfaeffd0 00000000 cf81dd58
[ 2243.867634] ffe0: c0055cb8 c00404a4 00000000 cfaefff8 c00404a4 c0055cc4 d8deebf4 edf760b7
[ 2243.876157] Backtrace: 
[ 2243.878718] [<c024d8bc>] (nand_read_byte+0x0/0x20) from [<c024db4c>] (nand_check_wp+0x48/0x58)
[ 2243.887710] [<c024db04>] (nand_check_wp+0x0/0x58) from [<c0251420>] (nand_do_write_ops+0xd8/0x3bc)
[ 2243.897049] r5:cf9a4810 r4:cfaefd98
[ 2243.900789] [<c0251348>] (nand_do_write_ops+0x0/0x3bc) from [<c0251890>] (nand_write+0x8c/0xa8)
[ 2243.909865] [<c0251804>] (nand_write+0x0/0xa8) from [<c0244d6c>] (part_write+0x6c/0x8c)
[ 2243.918208] r7:00000000 r6:031a7000 r5:00000000 r4:00780000
[ 2243.924137] [<c0244d00>] (part_write+0x0/0x8c) from [<c026504c>] (ubi_io_write+0x58/0xb4)
[ 2243.932661] r7:00000800 r6:cfaefe1c r5:0000018d r4:00006800
[ 2243.938584] [<c0264ff4>] (ubi_io_write+0x0/0xb4) from [<c0263370>] (ubi_eba_write_leb+0x84/0x828)
[ 2243.947832] r7:00000800 r6:00005800 r5:0000018d r4:cf9a4000
[ 2243.953754] [<c02632ec>] (ubi_eba_write_leb+0x0/0x828) from [<c02625bc>] (ubi_leb_write+0x100/0x104)
[ 2243.963297] [<c02624bc>] (ubi_leb_write+0x0/0x104) from [<c017418c>] (ubifs_leb_write+0x58/0xa4)
[ 2243.972455] r8:00000800 r7:00005800 r6:000003b6 r5:cfaae000 r4:cfaae000
[ 2243.979471] [<c0174134>] (ubifs_leb_write+0x0/0xa4) from [<c01749b4>] (ubifs_wbuf_sync_nolock+0x90/0x134)
[ 2243.989444] r8:00000002 r7:000007c0 r6:00000800 r5:cfaae000 r4:cfaa6330
[ 2243.996460] [<c0174924>] (ubifs_wbuf_sync_nolock+0x0/0x134) from [<c0174ba8>] (ubifs_bg_wbufs_sync+0xd0/0x170)
[ 2244.006887] r7:00000130 r6:cfaa6330 r5:00000001 r4:cfaae000
[ 2244.012812] [<c0174ad8>] (ubifs_bg_wbufs_sync+0x0/0x170) from [<c017d148>] (ubifs_bg_thread+0x94/0x120)
[ 2244.022624] [<c017d0b4>] (ubifs_bg_thread+0x0/0x120) from [<c0055d48>] (kthread+0x90/0x94)
[ 2244.031239] r7:00000013 r6:c017d0b4 r5:cfaae000 r4:cf81dd58
[ 2244.037171] [<c0055cb8>] (kthread+0x0/0x94) from [<c00404a4>] (do_exit+0x0/0x67c)
[ 2244.044970] r6:c00404a4 r5:c0055cb8 r4:cf81dd58
[ 2244.049798] Code: e92dd800 e24cb004 e59030cc e5933000 (e5d30000) 
[ 2244.056213] —[ end trace 1b75b31a2719ed21 ]—

请问该怎么解决，谢谢

Jian Zhou：

修改fpag driver初始化部分对GPMC寄存器配置就可以了吧？

Yaoming Qin：

看了你的log，其中提到   Unhandled fault: external abort on non-linefetch (0x1008) at 0xd083a000

可见是在这个地址出现异常了，请问您可否正常访问nand上的文件系统，如果不行，可能是在访问nand的时候，fpga破坏了数据，地址等信号的上下拉，导致gpmc读写不正常，所以需要做好切换。

rabbit：

回复 Yaoming Qin:

你好，谢谢解答。问题我排查了一下，发现在问题在fpga驱动部分。我在开始时复位了GPMC寄存器，导致nand出错。我现在遇到另外一个问题。通过

 gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG1, gpmc_nor[0]); gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG2, gpmc_nor[1]); gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG3, gpmc_nor[2]); gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG4, gpmc_nor[3]); gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG5, gpmc_nor[4]); gpmc_cs_write_reg(GPMC_CS, GPMC_CS_CONFIG6, gpmc_nor[5]); if (gpmc_cs_request(GPMC_CS, SZ_64K, (unsigned long *)&mem_base) < 0){  printk(KERN_ERR "Failed request for GPMC mem for usrp_e\n");  return -1; } printk("Got CS1, address = %lx\n", mem_base); if (!request_mem_region(mem_base, SZ_64K, "mem_fpga")) {  printk(KERN_ERR "Request_mem_region failed.\n");  gpmc_cs_free(GPMC_CS);  return -1; }

 fpga_base = ioremap(mem_base, SZ_64K);  printk("fpga_base %p\n",fpga_base);

得到基地址：fpga_base.

通过函数write向fpga_base写数据，发现数据写到fpga内部双口ram的0x2001位置，没有写在fpga双口ram的基地址。请问怎么解决，谢谢

Jian Zhou：

回复 rabbit:

我觉得可以参考nand driver看一下是怎么处理内存访问空间的