i.MX53 Redundant Boot -blog archive

shaojun_wang — Thu, 05 Apr 2012 06:48:18 GMT

i.MX53 ROM supports redundant boot. Boot primary or secondary image by the setting of PERSIST_SECONDARY_BOOT.

The value of PERSIST_SECONDARY_BOOT is stored in SRTC LPGR register.

Following steps describe how to enable and verify redundant boot from NAND and SD in i.MX53 ARD board.

Redundant Boot from NAND flash

Verified in 1109 BSP, the NAND device is SAMSUNG K9G8G08U0B, 2048 bytes/page, 128 pages/block, 4 bits ecc.

The default kobs-ng in 1109 BSP can only program primary u-boot.bin into NAND.

0001-support-redundant-boot-from-nand.patch is patch that support to program both primary and secondary u-boot.bin into NAND. The binary is kobs-ng.

1. Set boot switch to boot from SD card

1 2 3 4 5 6 7 8 9 0

OFF OFF ON OFF OFF OFF OFF OFF ON OFF

In Linux, program u-boot-mx53-ard-ddr3.bin to mtd0

$ flash_eraseall /dev/mtd0

$ ./kobs-ng init -v --chip_0_device_path=/dev/mtd0 u-boot-mx53-ard-ddr3.bin

From the log, primary u-boot is programmed to 0x00200000 - 0x00237000, secondary u-boot is programmed to 0x00900000 - 0x00937000.

2. Configure boot switch to boot from NAND

1 2 3 4 5 6 7 8 9 0

OFF OFF OFF ON OFF ON OFF OFF ON ON

3. Boot up, from u-boot command, dump SRTC LPGR to verify i.MX53 boot from primary u-boot.

MX53-ARD-DDR3 U-Boot > md.l 0x53FA401c 1

The return value is 0, mean boot from primary u-boot.

4. From u-boot command, destroy primary u-boot so the secondary can be booted.

MX53-ARD-DDR3 U-Boot > nand write 0x70800000 0x220000 0x800

5. Reboot, check register LPRG

MX53-ARD-DDR3 U-Boot > md.l 0x53FA401c 1

The return value is 0x40000000, mean boot from secondary u-boot.

Redundant Boot from SD

1. To support secondary image, the primary image must reserve space for secondary image table. The structure layout is

0x00000000 ~ 0x000001FF Reserve for MBR

0x00000200 ~ 0x000003FF Reserve for secondary image table

0x00000400 ~ 0xxxxxxxxx Boot image

2. The secondary image table start from 0x200 on boot media. The layout is

Offset in boot media value

0x200 0

0x204 0

0x208 0x00112233

0x20c FirstSectorNumber

0x210 0

0x00112233 is the tag value of mx53.

FirstSectorNumber is the first 512B sector number of secondary image.

3. Create primary boot image

$ sudo dd if=u-boot_pri.bin of=/dev/sdc bs=1K seek=1 skip=1

4. Create secondary boot image, in this example, start from 400KB.

$ sudo dd if=u-boot-sec.bin of=/dev/sdc bs=1K seek=400

5. Create secondary image table. header is the example, data inside header is

0x0 0

0x4 0

0x8 0x00112233

0xc 0x320

0x10 0

Since the offset of secondary image is 400KB, the FirstSectorNumber is 400*1024/512=0x320.

To create secondary image table, run below command

$ sudo dd if=header of=/dev/sdc bs=1 seek=512 count=20

If want to change the offset of secondary image, can modify file header by hexedit.exe.

5. Destroy primary u-boot by setting the entry of ivt to 0, so rom can jump to secondary image.

$ sudo dd if=/dev/zero of=/dev/sdc bs=1 seek=1028 count=4

6. Set boot switch to boot from SD

1 2 3 4 5 6 7 8 9 0

OFF OFF ON OFF OFF OFF OFF OFF ON OFF

After boot up u-boot, can verify if boot from secondary image by checking LPRG register

MX53-ARD-DDR3 U-Boot > md.l 0x53FA401c 1

The return value should be 0x40000000

7. For uboot after 2014.08, since there is not 1K offset in the image head, the program command is

$ sudo dd if=u-boot_pri.bin of=/dev/sdc bs=1K seek=1

To support secondary boot on such uboot, the secondary image should be downloaded to offset+1K, such as

$ sudo dd if=u-boot-sec.bin of=/dev/sdc bs=1K seek=401

kobs-ng and uboot nand patch

More patch about kobs and uboot can be found in https://community.freescale.com/thread/304760

Original Attachment has been moved to: 48-ubootmx53ardddr3.bin

Original Attachment has been moved to: 50-hexedit.exe

Original Attachment has been moved to: 46-0001supportredundantbootfromnand.patch

Re: i.MX53 Redundant Boot -blog archive

Gatts — Wed, 05 Sep 2012 21:09:44 GMT

Can you let me know if you've any pointers for how to boot up as redundant boot in SD Card.This is in case if it fails to boot up from the primary partition.

Re: i.MX53 Redundant Boot -blog archive

shaojun_wang — Fri, 07 Sep 2012 02:22:10 GMT

Please follow "Redundant Boot from SD" to verify how to boot redundant image from SD card

Re: i.MX53 Redundant Boot -blog archive

DirkBehme — Tue, 04 Dec 2012 06:49:35 GMT

Two questions:

1) Should this work on i.MX6, too?

2) Should this work for parallel and SPI NOR boot, too? If so, how would this look like?

Re: i.MX53 Redundant Boot -blog archive

julienc — Tue, 16 Dec 2014 16:45:42 GMT

I have the same question :

Should this work on i.MX6, too? Because i follow this instructions and nothing append.

Re: i.MX53 Redundant Boot -blog archive

shaojun_wang — Wed, 17 Dec 2014 02:04:41 GMT

It can work on i.MX6

Re: i.MX53 Redundant Boot -blog archive

julienc — Wed, 17 Dec 2014 09:05:35 GMT

Thanks for your answer.

But I have questions :

1) u-boot_pri.bin contains u-boot.bin and the IVT table and DCD instructions ? or just the u-boot.bin ?

2) same question about u-boot-sec.bin ?

I tried to used the secondary image Table and modify the file header to boot on the same u-boot.

I write 0x0002 instead of 0x320 in the first sector.

To boot with the secondary image table I wrote 1 on the flag PERSIST_SECONDARY_BOOT ( src->gpr10[30] ) in u-boot prompt.

I wrote reset in u-boot prompt and nothing append.

What I do wrong ?

I have an imx6qsabresd board.

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