Flashing BCB area using u-boot command

gnani — Tue, 24 May 2022 06:06:35 GMT

Dear All!

I have a custom board with an IMX6ULL on it.

It's set up to boot from NAND flash (MT29F2G08ABAGAWP)

I want to flash BCB area using u-boot command.

So I flashed BCB area as follow step

Step 1. Flash NAND boot(BCB) area using uuu command.

kobs-ng init -x -v --chip_0_device_path=/dev/mtd${NAND_uboot} /tmp/boot

Step 2. Update BCB area using u-boot command.

=> usb start => mw.b 0x81000000 0xFF 0x100000 => fatload usb 0:1 0x81000000 u-boot.imx => nandbcb init 0x81000000 NAND_uboot ${filesize}

But I found some dump value was different.

(Compared uuu flashed hex dump value of BCB area with u-boot command hex dump value of BCB area)

These two nandbcb dump value is same like as belows

=> nandbcb dump NAND_uboot device 0 offset 0x0, size 0x300000 NAND FCB read from 0x0 offset 0x400 read: OK NAND FCB read from 0x20000 offset 0x400 read: OK NAND FCB read from 0x40000 offset 0x400 read: OK NAND FCB read from 0x60000 offset 0x400 read: OK NAND DBBT read from 0x80000 offset 0x14 read: OK NAND DBBT read from 0xa0000 offset 0x14 read: OK NAND DBBT read from 0xc0000 offset 0x14 read: OK NAND DBBT read from 0xe0000 offset 0x14 read: OK FCB checksum = 0xfffffbec fingerprint = 0x20424346 version = 0x01000000 datasetup = 80 datahold = 60 addr_setup = 25 dsample_time = 6 pagesize = 2048 oob_pagesize = 2176 sectors = 64 nr_nand = 0 nr_die = 0 celltype = 0 ecc_type = 4 ecc_nr = 512 ecc_size = 512 ecc_level = 4 meta_size = 10 nr_blocks = 3 ecc_type_sdk = 0 ecc_nr_sdk = 0 ecc_size_sdk = 0 ecc_level_sdk = 0 nr_blocks_sdk = 0 meta_size_sdk = 0 erase_th = 0 bootpatch = 0 patch_size = 0 fw1_start = 512 fw2_start = 1024 fw1_pages = 342 fw2_pages = 342 dbbt_start = 256 bb_byte = 1999 bb_start_bit = 0 phy_offset = 2048 bchtype = 0 readlatency = 0 predelay = 0 cedelay = 0 postdelay = 0 cmdaddpause = 0 datapause = 0 tmspeed = 0 busytimeout = 0 disbbm = 0 spare_offset = 0 onfi_sync_enable = 0 onfi_sync_speed = 0 onfi_sync_nand_data = 0 disbbm_search = 0 disbbm_search_limit = 0 read_retry_enable = 0 DBBT : checksum = 0x00000000 fingerprint = 0x54424244 version = 0x01000000 dbbtpages = 0 Firmware: image #0 @ 0x200 size 0xab000 Firmware: image #1 @ 0x400 size 0xab000

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<Question>

1. Why these two hex dump values are different?

2. Device that BCB area is flashed by u-boot command is, OK?

(I want to use this nandbcb command if this method is OK)

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Best Regards

gnani

topic Flashing BCB area using u-boot command in i.MX Processors

Flashing BCB area using u-boot command