AnsweredAssumed Answered

bootlet fails to load u-boot

Question asked by Ankur Patel on Apr 3, 2014
Latest reply on Apr 8, 2014 by Ankur Patel

Hello Friends,


I am using prototype board based on i.mx28.

power supply is configured for VDD5V only. Based on the Application note AN4199: "Using i.MX28 power management unit and battery charger" on Pg#20.



  To enable the VDD5V only, I am referring Patch L2.6.35_10.12_SDK_5V_SUPPLY_PATCH.tar.gz at freescale website. I have applied the patch to bootlet code imx-bootlets-src-10.12.01.tar.gz.

I followed below steps to boot the u-boot:

1) Copied the u-boot under imx-bootlets-src directory after untaring and patching the source. Prototype uses the same Winbond RAM so no changes.

2) Export Toolchain path and added "BOARD = iMX28_EVK" to the Makefile

3) Performed "make" to create

4) Boot the prototype with USB boot option

5) load the image via command "sb_loader.exe -f"

Output on console:

PowerPrep start initialize power...

Configured for 5v only power source.            Battery powered operation disabled.

Apr  3 201414:02:29

FRAC 0x92925552

memory type is DDR2

                   Wait for ddr ready 1power 0x00820616

Frac 0x92925552

start change cpu freq

hbus 0x00000003

cpu 0x00010001

start test memory accress

ddr2 0x40000000

finish simple test


U-Boot 2013.04-00053-g08868db-dirty (Mar 31 2014 - 15:23:12)

CPU:   Freescale i.MX28 rev1.2 at 454 MHz


DRAM:  61 Bytes


Any suggestions why U-boot fails to find the boot mode and fails to execute? Is there any way I can test the same code on EVK, as looking to the EVK schematics, it seems that it has implemented DCDC_BATT source hardware configuration?