NAND boot imx6

[adnanali]

I am trying to nand boot my mx6 based custom board. I have written the FCB manually. I can see the IVT header being placed at 0x907400

S:0x00907400: 0x0D100000  0x00040200  0x00000908  : ............

S:0x0090740C: 0x91800000  0x90C00907  0x8EC00907  : ............

S:0x00907418: 0x00000907  0x00000000  0x8EC00000  : ............

S:0x00907424: 0x00000903  0x0000000B  0x0D200000  : .......... .

S:0x00907430: 0x0CC40080  0x00004040  0x00000000  : ....@@......

S:0x0090743C: 0x00000000  0x00000000  0x00000000  : ............

S:0x00907448: 0x00000000  0x80000000  0x00000000  : ............

S:0x00907454: 0x00000000  0x00000000  0x00000000  : ............

S:0x00907460: 0x00000000  0x00000000  0x00000000  : ............

S:0x0090746C: 0x00000000  0x00000000  0x00000000  : ............

But I could not get my SPL loaded and executed. I have Nullified the DBBT so that ROM code does not search for the BAD blocks in the NAND. I have also tested kobs-ng tool here are the steps

dd if=SPL of=SPL-nand bs=512 seek=2
kobs-ng init -v SPL-nand

After it when I reboot the board it does not boot SPL neither fall back to USB boot which means that FCB is good to go. I cannot see the IVT header at 0x907400 in this case when I connect through JTAG

where as when I use my FCB command it fall backs to usb boot :smileysad:.

Moreover you can see that at address 907400 it is not the exact IVT header.The first four bytes are 402000D1 in the hexdump of the SPL

I have loaded the same SPL from usb tool and it works. I am using dstream and ds5 for JTAG debugging.

Am i missing something here ?

[igorpadykov]

Hi adnan

as IVT header is wrong at address 907400, there may be hardware

issues, one can try attached simple read/write page nand test.

In general one can boot from sd and write uboot with kobs-ng

using as example mfg tools scripts ucl2.xml, *.vbs for sabre-ai

board (it has nand). Recommended to use uboot built for that boards,

check latest BSPs

Board Support Packages (29)

L3.14.52_1.1.0_MX6QDLSOLO (REV L3.14.52_1.1.0)

Programmers (Flash, etc.) (8)

IMX6_L3.14.52_MFG_TOOL (REV L3.14.52_1.1.0)

http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/i.mx-applications-process...

Best regards

igor

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[adnanali]

I have already tested kobs-ng tool. Here is the procedure

1) NAND boot falls back to USB boot

2) Connect JTAG

3) Run SPL (u-boot-spl)

4) Run u-boot.imt (u-boot)

5) Use tftp to load kernel and dtb

6) bootz

when the kernel is up I can see /dev/mtd0 device.

from kernel I use

dd if=SPL of=SPL-nand bs=512 seek=2

kobs-ng init -v SPL-nand

After reboot the board does not boot SPL. However it even does not even fall back to USB which means it is working but 50%.

you mentioned the IVT header is not correct. What i understand is, it should be 0x402000D1 at address 0x907400, right ?

I tried mfg tool but board did not get detected. I am using yocto, is there a way to test the nand in it ?

[igorpadykov]

one can test NAND using board configuration for sabre-ai boards, refer to

attached Release NotesTable 3. Kernel and device tree configurations

and Yocto Guide sect.5.1 Build configurations.

Also NXP/FSL uboot does not use SPL.

Board Support Packages (29)

L3.14.52_1.1.0_MX6QDLSOLO (REV L3.14.52_1.1.0)

http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/i.mx-applications-process...

~igor

[adnanali]

But my custom board deviates from the sabreai iomux by a great deal. It would require setting up those muxes in uboot and kernel.

Is there any way I can port this nand test ?

you mentioned the IVT header is not correct. What i understand is, it should be 0x402000D1 at address 0x907400, right ?

[igorpadykov]

right, you will have to port it for using sabreai

configuration. IVT header is described in sect.8.6.1.1 Image Vector

Table Structure iMX6DQ RM

[adnanali]

With a few changes in the FCB i was able to locate my IVT header at correct location 0x907400.

S:0x00907400:	0x402000D1	0x00908000	0x00000000	:	.. @........
S:0x0090740C:	0x00907918	0x0090790C	0x009078EC	:	.y...y...x..
S:0x00907418:	0x00000000	0x00000000	0x009038EC	:	.........8..
S:0x00907424:	0x0000B000	0x00000000	0x400800D2	:	...........@

I cannot see the SPL code at address 0x00908000. which is the entry point of the application.

What happens after the IVT is placed at 907400 or at what stage is the application copied from NAND to IRAM/DRAM ? I am sure you cannot share the ROM code but can atleast guide me through the stages.

Regards

[igorpadykov]

after locating IVT ROM copies data according to

Figure 8-21. Image Vector Table i.MX6DQ Reference Manual

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf

You can check if some data are present in DDR

("Dest. Memory" in Figure 8-2)and if DDR is correctly initialized

(just read/write to it with jtag)

~igor

[adnanali · Accepted solution]

the problem was with the DCD table of SPL. After enabling NAND clocks I was able to boot from NAND

Thanks Igor for your help and time.

Kind Regards