Imx6s custom board, mmu init issue

jfg — Fri, 07 Feb 2014 07:12:34 GMT

Hi,

I am trying to get a custom board based of the SabreSD board up and running. The board has a IMX6 solo processor and a different DDR from the sabresd board. At the moment im trying to create two images, u-boot and linux, that can be used with the MFG-tool to flash the emmc.

I have followed the instructions in the "i.MX 6Solo/6DualLite BSP Porting Guide" and the documentation from the MFG tool "Manufacturing Tool V2 Linux or Android Firmware Development Guide V2.docx".

I have updated the DCD table and have tried it with the "DDR_Stress_Tester_V1.0.1" and it does not report any errors. I have also given the board a custom machine number and added it to the register site.

My issue is that the board fails to execute beyond the point below.

U-Boot 2009.08-00698-g928df9c-dirty (Feb 06 2014 - 17:06:17)

CPU: Freescale i.MX6 family TO1.1 at 792 MHz

Thermal sensor with ratio = 187

Temperature: 40 C, calibration data 0x5a15255f

mx6q pll1: 792MHz

mx6q pll2: 528MHz

mx6q pll3: 480MHz

mx6q pll8: 50MHz

ipg clock : 66000000Hz

ipg per clock : 66000000Hz

uart clock : 80000000Hz

cspi clock : 60000000Hz

ahb clock : 132000000Hz

axi clock : 198000000Hz

emi_slow clock: 99000000Hz

ddr clock : 396000000Hz

usdhc1 clock : 198000000Hz

usdhc2 clock : 198000000Hz

usdhc3 clock : 198000000Hz

usdhc4 clock : 198000000Hz

nfc clock : 24000000Hz

Board: i.MX6DL/Solo-ChamHigh: unknown-board Board: 0x61011 [POR ]

Boot Device: NOR

I2C: ready

DRAM: 1 GB

MMC: mmc init start

usdhc gpio init SLUT

FSL_USDHC: 0

Using default environment

In: serial

Out: serial

Err: serial

Board late init Start

Board late init SLUT

Net: No ethernet found.

Hit any key to stop autoboot: 0

* kernel: cmdline image address = 0x10800000

## Booting kernel from Legacy Image at 10800000 ...

Image Name: Linux-3.0.35-03028-g0231539-dirt

Image Type: ARM Linux Kernel Image (uncompressed)

Data Size: 6958796 Bytes = 6.6 MB

Load Address: 10008000

Entry Point: 10008000

Verifying Checksum ... OK

kernel data at 0x10800040, len = 0x006a2ecc (6958796)

Loading Kernel Image ... OK

kernel loaded at 0x10008000, end = 0x106aaecc

Using machid 0x12fb

## Transferring control to Linux (at address 10008000) ...

Starting kernel ...

Uncompressing Linux... done, booting the kernel.

I have traced it to the point where it tries to turn on the MMU by setting gpio pins.

__turn_mmu_on:

mov r0, r0

mcr p15, 0, r0, c1, c0, 0 @ write control reg

mrc p15, 0, r3, c0, c0, 0 @ read id reg

mov r3, r3

mov r3, r13

mov pc, r3

__enable_mmu_end:

ENDPROC(__turn_mmu_on)

My guess is that I must have missed setting up something important before reaching this point in the startup. I would very much appreciate any ideas on what could cause this issue and how I could solve it. Please let me know if I have failed to provide any information that you think is vital to the question.

Re: Imx6s custom board, mmu init issue

AnsonHuang — Sat, 08 Feb 2014 05:30:10 GMT

Hi, Johan

Since this mmu initial code are common and there is nothing special we need to do during kernel boot up, so I would like to know whether you have turned off cache, mmu correctly in uboot before jumping to kernel, can you help double check it?

Re: Imx6s custom board, mmu init issue

dubravkomoravsk — Tue, 26 Aug 2014 14:12:49 GMT

Hi Johan,

I have quite a similar problem. Were you able to make any progress?

Re: Imx6s custom board, mmu init issue

mohsengh — Wed, 06 Mar 2019 08:35:48 GMT

Hi Johan,

I have exactly the same problem.

did you manage to solve it?

thanks

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Imx6s custom board, mmu init issue

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Re: Imx6s custom board, mmu init issue