linux-2.6.38到tiny6410的移植手册（1）：nand flash

2024-10-15 来源：cnblogs

环境 VirtualBox+ubuntu 10.04
编译器，友善自带arm-linux-gcc-4.5.1-v6-vfp-20101103.tgz
硬件，tiny6410，核心板号1107

1、下载linux-2.6.38的源码，ftp://ftp.kernel.org/pub/linux/kernel/v2.6/linux-2.6.38.tar.bz2
2、解压 tar xvfj /mnt/ubuntu/linux-2.6.38.tar.bz2 -C .
3、vi Makefile       191行改为    ARCH            ?= arm
4、cp arch/arm/configs/s3c6400_defconfig .config
5、make menuconfig
5、General setup->(/usr/4.5.1/bin/arm-linux-) Cross-compiler tool prefix    我将编译器解压到了/usr/4.5.1目录
       System Type->[*] MINI6410   选上，其他的可以去掉，不确定的可以参考友善之臂的

这样编译出来的内核是可以被uboot引导的，然后是增加nand flash支持
vi arch/arm/mach-s3c64xx/mach-mini6410.c
第117行
struct mtd_partition mini6410_nand_part[] = {
    {
        .name        = 'Bootloader',
        .offset        = 0,
        .size        = (4 * 128 *SZ_1K),
        .mask_flags    = MTD_CAP_NANDFLASH,
    },
    {
        .name        = 'Kernel',
        .offset        = (4 * 128 *SZ_1K),
        .size        = (5*SZ_1M) ,
        .mask_flags    = MTD_CAP_NANDFLASH,
    },
    {
        .name        = 'File System',
        .offset        = MTDPART_OFS_APPEND,
        .size        = MTDPART_SIZ_FULL,
    }
};       //update at 2011-8-26 经过测试发现，这里改完后根本不起作用，甚至将整个注释也无妨，估计分区已经固死在后面的s3c_nand_mlc.fo中

drivers/mtd/nand/s3c_nand.c和arch/arm/plat-samsung/include/plat/regs-nand.h两个文件可以从友善的源码中
拷贝过来，这是他们自己写的，当然drivers/mtd/nand/s3c_nand_mlc.fo也要拷贝过来，这是友善没有开源的一个驱动之一，
所以不用研究了，拷过来就是了。

################################################################

修改drivers/mtd/nand/nand_base.c文件

修改方法如下，“-”就是要去掉的内容，“+”就是要增加的内容，@@后面的是行号，
嫌麻烦的的直接将drivers/mtd/nand/nand_base.c拷过来覆盖掉

嘿嘿，下面是我diff出来的东西。

@@ -342,7 +342,7 @@
  */
static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
{
-    int page, chipnr, res = 0;
+    int page, res = 0;
     struct nand_chip *chip = mtd->priv;
     u16 bad;

@@ -351,6 +351,8 @@

     page = (int)(ofs >> chip->page_shift) & chip->pagemask;

+#if 0
+    /* Moved to nand_block_checkbad() for chip specify support */
     if (getchip) {
         chipnr = (int)(ofs >> chip->chip_shift);

@@ -359,6 +361,7 @@
         /* Select the NAND device */
         chip->select_chip(mtd, chipnr);
     }
+#endif

     if (chip->options & NAND_BUSWIDTH_16) {
         chip->cmdfunc(mtd, NAND_CMD_READOOB, chip->badblockpos & 0xFE,
@@ -378,8 +381,10 @@
     else
         res = hweight8(bad) < chip->badblockbits;

+#if 0
     if (getchip)
         nand_release_device(mtd);
+#endif

     return res;
}
@@ -477,9 +482,26 @@
                    int allowbbt)
{
     struct nand_chip *chip = mtd->priv;
+    int chipnr, res = 0;
+
+    /* Chip specify block_bad() support */
+    if (!chip->bbt) {
+        if (getchip) {
+            chipnr = (int)(ofs >> chip->chip_shift);

-    if (!chip->bbt)
-        return chip->block_bad(mtd, ofs, getchip);
+            nand_get_device(chip, mtd, FL_READING);
+
+            /* Select the NAND device */
+            chip->select_chip(mtd, chipnr);
+        }
+
+        res = chip->block_bad(mtd, ofs, getchip);
+
+        if (getchip)
+            nand_release_device(mtd);
+
+        return res;
+    }

     /* Return info from the table */
     return nand_isbad_bbt(mtd, ofs, allowbbt);
@@ -3002,23 +3024,15 @@
                 id_data[0] == NAND_MFR_SAMSUNG &&
                 (chip->cellinfo & NAND_CI_CELLTYPE_MSK) &&
                 id_data[5] != 0x00) {
+            int __oobsz[] = { 0, 128, 218, 400 };
             /* Calc pagesize */
             mtd->writesize = 2048 << (extid & 0x03);
             extid >>= 2;
             /* Calc oobsize */
-            switch (extid & 0x03) {
-            case 1:
-                mtd->oobsize = 128;
-                break;
-            case 2:
-                mtd->oobsize = 218;
-                break;
-            case 3:
-                mtd->oobsize = 400;
-                break;
-            default:
+            if (extid & 0x10) {
                 mtd->oobsize = 436;
-                break;
+            } else {
+                mtd->oobsize = __oobsz[(extid & 0x03)];
             }
             extid >>= 2;
             /* Calc blocksize */
@@ -3099,16 +3113,21 @@

     /* Calculate the address shift from the page size */
     chip->page_shift = ffs(mtd->writesize) - 1;
+
     /* Convert chipsize to number of pages per chip -1. */
-    chip->pagemask = (chip->chipsize >> chip->page_shift) - 1;
+    if (!chip->pagemask) {
+        chip->pagemask = (chip->chipsize >> chip->page_shift) - 1;
+    }

     chip->bbt_erase_shift = chip->phys_erase_shift =
         ffs(mtd->erasesize) - 1;
-    if (chip->chipsize & 0xffffffff)
-        chip->chip_shift = ffs((unsigned)chip->chipsize) - 1;
-    else {
-        chip->chip_shift = ffs((unsigned)(chip->chipsize >> 32));
-        chip->chip_shift += 32 - 1;
+    if (!chip->chip_shift) {
+        if (chip->chipsize & 0xffffffff)
+            chip->chip_shift = ffs((unsigned)chip->chipsize) - 1;
+        else {
+            chip->chip_shift = ffs((unsigned)(chip->chipsize >> 32));
+            chip->chip_shift += 32 - 1;
+        }
     }

     /* Set the bad block position */
@@ -3126,8 +3145,11 @@
      */
     if ((chip->cellinfo & NAND_CI_CELLTYPE_MSK) &&
             (*maf_id == NAND_MFR_SAMSUNG ||
-             *maf_id == NAND_MFR_HYNIX))
-        chip->options |= NAND_BBT_SCANLASTPAGE;
+             *maf_id == NAND_MFR_HYNIX)) {
+        if (mtd->writesize < 4096) {
+            chip->options |= NAND_BBT_SCANLASTPAGE;
+        }
+    }
     else if ((!(chip->cellinfo & NAND_CI_CELLTYPE_MSK) &&
                 (*maf_id == NAND_MFR_SAMSUNG ||
                  *maf_id == NAND_MFR_HYNIX ||


然后修改drivers/mtd/nand/Kconfig和drivers/mtd/nand/Makefile文件
在drivers/mtd/nand/Kconfig  238行增加
config MTD_NAND_S3C
    tristate 'NAND Flash support for S3C SoC'
    depends on (ARCH_S3C64XX || ARCH_S5P64XX || ARCH_S5PC1XX) && MTD_NAND
    help
      This enables the NAND flash controller on the S3C.

      No board specfic support is done by this driver, each board
      must advertise a platform_device for the driver to attach.

config MTD_NAND_S3C_DEBUG
    bool 'S3C NAND driver debug'
    depends on MTD_NAND_S3C
    help
      Enable debugging of the S3C NAND driver

configMTD_NAND_S3C_HWECC
    bool 'S3C NAND Hardware ECC'
    depends on MTD_NAND_S3C
        help
      Enable the use of the S3C's internal ECC generator when
      using NAND. Early versions of the chip have had problems with
      incorrect ECC generation, and if using these, the default of
      software ECC is preferable.

      If you lay down a device with the hardware ECC, then you will
      currently not be able to switch to software, as there is no
      implementation for ECC method used by the S3C

drivers/mtd/nand/Makefile中20行增加
obj-$(CONFIG_MTD_NAND_S3C)            += s3c_nand.o

末尾再增加
S3C_NAND_MLC_SRC = $(shell ls drivers/mtd/nand/s3c_nand_mlc.c 2>/dev/null)
ifeq ($(S3C_NAND_MLC_SRC),)
obj-$(CONFIG_MTD_NAND_S3C) += s3c_nand_mlc.fo
else
obj-$(CONFIG_MTD_NAND_S3C) += s3c_nand_mlc.o
endif

然后再make menuconfig
   Device Drivers--->
             <*> Memory Technology Device (MTD) support  --->
                             [*]   MTD partitioning support
                              [*]     Command line partition table parsing
                             <*>   Direct char device access to MTD devices
                            <*>   Caching block device access to MTD devices
                            <*>   NAND Device Support  --->
                                                      < >   NAND Flash support for Samsung S3C SoCs  去掉不要选
                                                      <*>   NAND Flash support for S3C SoC
                                                                  [*]     S3C NAND Hardware ECC

make zImage
编译出来了，nand flash就可以用了。