想自己移植一遍linux-2.6.38，參考友善給的源碼，覺得既然源碼都有了，想發掘移植步驟應該不難吧，嘿嘿
環境 VirtualBox+Ubuntu 10.04
編譯器，友善自帶arm-linux-gcc-4.5.1-v6-vfp-20101103.tgz
硬件，tiny6410，核心板號1107
1、下載linux-2.6.38的源碼，ftp://ftp.kernel.org/pub/linux/kernel/v2.6/linux-2.6.38.tar.bz2
2、解壓 tar xvfj /mnt/ubuntu/linux-2.6.38.tar.bz2 -C .
3、vi Makefile 191行改為 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 我將編譯器解壓到了/usr/4.5.1目錄
System Type->[*] MINI6410 選上，其他的可以去掉，不確定的可以參考友善之臂的
這樣編譯出來的內核是可以被uboot引導的，然後是增加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 經過測試發現，這裡改完後根本不起作用，甚至將整個注釋也無妨，估計分區已經固死在後面的s3c_nand_mlc.fo中
drivers/mtd/nand/s3c_nand.c和arch/arm/plat-samsung/include/plat/regs-nand.h兩個文件可以從友善的源碼中
拷貝過來，這是他們自己寫的，當然drivers/mtd/nand/s3c_nand_mlc.fo也要拷貝過來，這是友善沒有開源的一個驅動之一，
所以不用研究了，拷過來就是了。
修改drivers/mtd/nand/nand_base.c文件
修改方法如下，“-”就是要去掉的內容，“+”就是要增加的內容，@@後面的是行號，
嫌麻煩的的直接將drivers/mtd/nand/nand_base.c拷過來覆蓋掉
嘿嘿，下面是我diff出來的東西。
@@ -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 ||
然後修改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
然後再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 去掉不要選
<*> NAND Flash support for S3C SoC
[*] S3C NAND Hardware ECC
make zImage
編譯出來了，只要出現正常內核分區就說明nand 驅動可以用了，若想看見文件系統，請看連載二NFS 見 http://www.linuxidc.com/Linux/2012-01/52086p2.htm。
改天增加網卡驅動，然後就可以搭NFS文件系統了，呵呵
