AM335X u-boot擦除NAND Flash很慢这是什么原因？怎么解决？

本帖最后由 一只耳朵怪 于 2018-6-5 16:16 编辑

大家好，在移植AM335X的时候又遇到了一个问题：在u-boot操作NAND Flash时很慢，具体情况如下：
SDK版本：ti-processor-sdk-linux-am335x-evm-03.02.00.05
问题描述：我有两块板子，第一块是网上买的demo，上面是512MByte的NAND（型号：29F4G08ABADA）;第二块是自己做的板子，上面是256MByte的NAND（型号：29F4G08ABADA），我编译好Uboot后在装置上运行，两块板子均能正确识别NAND，但是当执行nand erase.chip进行擦除时出了问题，第一块板子512M的NAND很快擦除，大概几秒钟就完成，但是第二块256M的NAND则很慢，大概需要20几分钟，这是什么原因呢？
nand_pin_mux如下：
static struct module_pin_mux hxdw_nand_pin_mux[] = [
[OFFSET(gpmc_ad0), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD0 */
[OFFSET(gpmc_ad1), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD1 */
[OFFSET(gpmc_ad2), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD2 */
[OFFSET(gpmc_ad3), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD3 */
[OFFSET(gpmc_ad4), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD4 */
[OFFSET(gpmc_ad5), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD5 */
[OFFSET(gpmc_ad6), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD6 */
[OFFSET(gpmc_ad7), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD7 */
#ifdef CONFIG_SYS_NAND_BUSWIDTH_16BIT
[OFFSET(gpmc_ad8), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD8 */
[OFFSET(gpmc_ad9), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD9 */
[OFFSET(gpmc_ad10), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD10 */
[OFFSET(gpmc_ad11), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD11 */
[OFFSET(gpmc_ad12), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD12 */
[OFFSET(gpmc_ad13), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD13 */
[OFFSET(gpmc_ad14), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD14 */
[OFFSET(gpmc_ad15), (MODE(0) | PULLUDDIS | RXACTIVE)], /* AD15 */
#endif
[OFFSET(gpmc_wait0), (MODE(0) | PULLUP_EN | RXACTIVE)], /* nWAIT */
[OFFSET(gpmc_wpn), (MODE(7) | PULLUP_EN)], /* nWP */
[OFFSET(gpmc_csn0), (MODE(0) | PULLUP_EN)], /* nCS */
[OFFSET(gpmc_wen), (MODE(0) | PULLDOWN_EN)], /* WEN */
[OFFSET(gpmc_oen_ren), (MODE(0) | PULLDOWN_EN)], /* OE */
[OFFSET(gpmc_advn_ale), (MODE(0) | PULLDOWN_EN)], /* ADV_ALE */
[OFFSET(gpmc_be0n_cle), (MODE(0) | PULLDOWN_EN)], /* BE_CLE */
[-1],
];

配置代码如下：
else if (board_is_hxdw()) [
configure_module_pin_mux(rgmii1_pin_mux);
configure_module_pin_mux(hxdw_mmc0_pin_mux);
configure_module_pin_mux(hxdw_nand_pin_mux);
]

各自的打印信息如下：
第二块板子：
U-Boot SPL 2016.05-00304-gad06f64-dirty (Apr 09 2017 - 13:33:00)
Trying to boot from MMC1
reading args
spl_load_image_fat_os: error reading image args, err - -1
reading u-boot.img
reading u-boot.img
reading u-boot.img
reading u-boot.img
U-Boot 2016.05-00304-gad06f64-dirty (Apr 09 2017 - 13:33:00 +0800)
CPU : AM335X-GP rev 2.1
Model: TI AM335x HXDW
Watchdog enabled
DRAM: 256 MiB
NAND: 256 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
reading uboot.env
** Unable to read "uboot.env" from mmc0:1 **
Using default environment
not set. Validating first E-fuse MAC
Net: Could not get PHY for ethernet@4a100000: addr 0
eth0: ethernet@4a100000
Warning: u***_ether MAC addresses don't match:
Address in SROM is de:ad:be:ef:00:01
Address in environment is 84:eb:18:bd:a8:9e
, eth1: u***_ether
Press SPACE to abort autoboot in 2 seconds
=> nand erase.chip
NAND erase.chip: device 0 whole chip
Erasing at 0xbae0000 -- 73% complete.（很慢）
第一块板子：
U-Boot SPL 2016.05-00304-gad06f64-dirty (Apr 09 2017 - 13:33:00)
Trying to boot from MMC1
reading args
spl_load_image_fat_os: error reading image args, err - -1
reading u-boot.img
reading u-boot.img
reading u-boot.img
reading u-boot.img

U-Boot 2016.05-00304-gad06f64-dirty (Apr 09 2017 - 13:33:00 +0800)
CPU : AM335X-GP rev 2.1
Model: TI AM335x HXDW
Watchdog enabled
DRAM: 512 MiB
NAND: 512 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
reading uboot.env
** Unable to read "uboot.env" from mmc0:1 **
Using default environment
not set. Validating first E-fuse MAC
Net: Could not get PHY for ethernet@4a100000: addr 0
eth0: ethernet@4a100000
Warning: u***_ether MAC addresses don't match:
Address in SROM is de:ad:be:ef:00:01
Address in environment is b0:d5:cc:81:84:a3
, eth1: u***_ether
Press SPACE to abort autoboot in 2 seconds
=> nand erase.chip
NAND erase.chip: device 0 whole chip
Erasing at 0x1ffe0000 -- 100% complete.
OK
=>（很快）

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