i.MX ProcessorsのトピックRe: U-Boot iMX233 process

U-Boot iMX233 process

sergiososa — Thu, 20 Apr 2017 00:05:44 GMT

We are developing from scratch our board

At this moment we already powered the iMX233 and configured it to boot form SD card
We connect our board to a PC via USB and change the value of HW_OCOTP_ROM0 to 0X00200008
We created the SD Card image using Olinomex development Kit and test it in this board and runs ok
We connect a logic analyzer to check the serial output pin126 from iMX233 and obtain the following output

U-BOOT 2017.01 (MAR 30 2017 – 17:48:18)

CPU: Freescale i.MX23 rev 1.4 AT 454 MHZ

Boot: SSP SD/MCC#0

DRAM: 64MiB

MMC: MXS MMC: 0

*** Warning – bad CRC, USING DEFAULT ENVIROMENT

IN: serial

OUT: serial

ERR: serial

NET: net initialization skip

Not Ethernet found

Hit any key to stop autoboot: 3

Hit any key to stop autoboot: 0

Our question is: “Why the boot process is stopped?” because in the development board the same SD card give us the following output

Hit any key to stop autoboot: 3

Hit any key to stop autoboot: 2

Hit any key to stop autoboot: 1

Hit any key to stop autoboot: 0 (why in our board jump from 3 to 0 so fast)

Switch to partitions #0, OK

MMC0 is current device

Reading boot.scr

**unable to read file boot.scr**

Reading uimage

1421336 bytes read in 454 ms (3 MiB – s)

Booting from MMC …

Reading imx23-olinuxino.dtb

10554 bytes read in 27 ms (380.9 KiB – s)

##booting kernel from legacy image at 42000000 …

Image name: ARM Openwrt linux 3.18.44

Image type: Linux Kernel image (uncompress)

Data size 1421272 bytes = 1.4 MiB

Load address 40008000

Entry point: 40008000

There find checksum…

##Flatting device tree blob at 41000000

Booting using the FDT BLOB at 0X41000000

Loading kernel image…

Loading device tree to 43b62000,end 43b67939…

Starting kernel

Booting linux on fisical CPU X0X

Linux version 3.1844

Messages continue until the boot process end

Re: U-Boot iMX233 process

sergiososa — Thu, 20 Apr 2017 05:10:48 GMT

We found the following information in www.olimex.com

Development board use RAM 46V32M16-5V REV F (out of production) but we have 46V32M16-5V REV J and Olimex confirm the board does not work with this version

How can we resolve this issue?

Re: U-Boot iMX233 process

igorpadykov — Thu, 20 Apr 2017 05:27:06 GMT

Hi Sergio

SD card for development board may not work on custom board due to possible ddr errors,

please try to test memory and rebuild image for custom board

https://community.nxp.com/message/481403?commentID=481403#comment-481403

i.MX28 DDR stress test | NXP Community

Best regards
igor
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Re: U-Boot iMX233 process

sergiososa — Thu, 20 Apr 2017 05:38:13 GMT

Thanks for your response Igor

I found another solution from someone in the forum and he suggest

Change de frequency to 96MHZ In boot_prep/init.c, uncomment the #define EMI_96M to enable this

What do you thing abount this solution?

Regards

Sergio

Matthew Clemens18-may-2011 11:04

This is usually indicative of a DDR problem.

The above message indicates you're using init_ddr_mt46v32m16_133Mhz - is this the DDR1 part on your board?

It is possible to run at 96MHz. In boot_prep/init.c, uncomment the #define EMI_96M to enable this. Suggest you try this and see if you can get the kernel uncompressed.

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danix19-may-2011 10:01

sure I,m using Micron DDR MT46V32M16

I changed the frequency to 96MHz and boot Linux successfully.

The thing is, I designed a 4 layer low cost board, so I compromised the EMI a little bit; seems I'm paying for that :-)

Thank you all

Re: U-Boot iMX233 process

igorpadykov — Thu, 20 Apr 2017 06:28:25 GMT

Hi Sergio

changing the frequency to 96MHz may help,

but does not guarantee that ddr will work fine in all use cases/conditions.

Best regards
igor

Re: U-Boot iMX233 process

sergiososa — Fri, 21 Apr 2017 22:37:36 GMT

We run the memory test successfully with the following messages

Memory read stop - non error reports, memory test is successfully finish

Uncompressing Linux................

done, booting the kernel

Now I want to generate u-boot with openwrt

I appreciate any advice

Best Regards

Sergio