topic Re: What changes have to be made in the source while migrating from 1GB DDR SOM to 512 MB SOM? in i.MX Processors

What changes have to be made in the source while migrating from 1GB DDR SOM to 512 MB SOM?

sujay1 — Mon, 23 Sep 2019 06:45:37 GMT

I'm using an imx6slevk board with yocto bsp with 1GB SOM.

In a previous project I had used android kitkat with a 512 MB som now I wish to flash my yocto images to this board but the board freezes while flashing rootfs

I'm flashing using mfg tool into emmc.

Kernel and u-boot seem to flash without a problem but then there is no progress in rootfs.

I tried changing the dts file memory node in kernel

imx6sl-evk.dts

memory

{

reg = <0x80000000 0x40000000>;
};

memory {
reg = <0x80000000 0x20000000>;
};

but there is no effect.

What should I modify for this?

Re: What changes have to be made in the source while migrating from 1GB DDR SOM to 512 MB SOM?

Yuri — Mon, 23 Sep 2019 08:16:16 GMT

Hello,

use Chapter 3 (Porting U-Boot) of "i.MX_BSP_Porting_Guide.pdf".

In particular - section 3.2.1 (Changing the DCD table for i.MX DDR initialization).

https://www.nxp.com/webapp/Download?colCode=L4.14.78_1.0.0_LINUX_DOCS

Have a great day,

Yuri

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Re: What changes have to be made in the source while migrating from 1GB DDR SOM to 512 MB SOM?

sujay1 — Mon, 23 Sep 2019 11:21:18 GMT

Hi yuri

These are the steps I did for ddr callibration.

1. Ran ddr test tool to get ddr_callibration(log is as below)

MMDC registers updated from calibration

Read calibration
MPRDDLCTL PHY0 (0x021b0848) = 0x4644484A

Write calibration
MPWRDLCTL PHY0 (0x021b0850) = 0x3A363A30

2. changes in imximage.cfg file:

DATA 4 0x021b0848 0x4646484a //changed to test for 512:old value 0x4241444a
DATA 4 0x021b0850 0x3a343a30 //changed to test for 512:old value 0x3030312b

3. dts file in uboot and kernel

memory {
reg = <0x80000000 0x20000000>; //it was 0x40000000 changed for 512 Mb
};

4. Build (u-boot kernel rfs) and flash to device

Log while flashing:

U-Boot 2017.03-imx_v2017.03_4.9.88_2.0.0_ga+ge88a4b5270 (Sep 23 2019 - 15:50:48 +0530)

CPU: Freescale i.MX6SL rev1.2 996 MHz (running at 792 MHz)
CPU: Commercial temperature grade (0C to 95C) at 49C
Reset cause: WDOG
Model: Freescale i.MX6 SoloLite EVK Board
Board: MX6SLEVK
DRAM: 1 GiB
Initializing for QP4720 bona 2P8 display
Initializing for bona 2P8 display
PMIC: PFUZE100! DEV_ID=0x10 REV_ID=0x21
MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
gpio@020ac000: get_value: error: gpio GPIO5_0 not reserved
*** Warning - bad CRC, using default environment

In: serial
Out: serial
Err: serial
Net:
Error: ethernet@02188000 address not set.
No ethernet found.
Boot from USB for mfgtools
Use default environment for mfgtools
Run bootcmd_mfg: run mfgtool_args;if test ${tee} = yes; then bootm ${tee_addr} ${initrd_addr} ${fdt_addr}; else bootz ${loadaddr} ${initrd_add;
Hit any key to stop autoboot: 0
Kernel image @ 0x80800000 [ 0x000000 - 0x5edac0 ]
## Loading init Ramdisk from Legacy Image at 83800000 ...
Image Name: fsl-image-mfgtool-initramfs-imx6
Image Type: ARM Linux RAMDisk Image (gzip compressed)
Data Size: 8594034 Bytes = 8.2 MiB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
## Flattened Device Tree blob at 83000000
Booting using the fdt blob at 0x83000000
Using Device Tree in place at 83000000, end 8300c538
switch to ldo_bypass mode!

Starting kernel ...

But the rootfs still doesn't flash it just hangs at kernel

I tried bitbake fsl-image-mfgtool-initramfs and it created a

fsl-image-mfgtool-initramfs-imx6slevk-20190923104008.rootfs.cpio.gz.u-boot file

but even this doesn't help in flashing.

am I missing something?

Re: What changes have to be made in the source while migrating from 1GB DDR SOM to 512 MB SOM?

Yuri — Tue, 24 Sep 2019 04:22:00 GMT

Hello,

can You try to create boot SD card for i.MX6SL on Linux host?

It does not require MFG.

Regards,

Yuri.

Re: What changes have to be made in the source while migrating from 1GB DDR SOM to 512 MB SOM?

sujay1 — Tue, 24 Sep 2019 05:48:55 GMT

Hi Yuri

It's a specific requirement to use mfg tool from the customer.. what can I do?

Re: What changes have to be made in the source while migrating from 1GB DDR SOM to 512 MB SOM?

Yuri — Tue, 24 Sep 2019 07:25:30 GMT

At least it is needed to check if new memory settings are working.

~Yuri.