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i.MX535 Custom Platform - Code Hang

Question asked by Sridevi Kandaswamy on Jun 24, 2013
Latest reply on Jul 13, 2013 by Sridevi Kandaswamy


I have our custom design based on i.MX535 SMD design with 512MB LPDDR2-S4 & 4GB eMMC Flash. The reference BSP details  taken for customization is given below.

Reference BSP

Patches taken from R10.4 Freescale Release

Uboot 2009.08

Android 2.3.7 Sabre Tablet BSP (Linux Kernel 2.6.35)


Have made the bootstraps for Micro-SD booting & have the Micro-SD card with all the images in the respective partitions.

One of the hardware is functioning ok with the Micro-SD booting and the BSP loading & execution is all fine in this hardware.


But in the second hardware platform, with the same set of images in Micro-SD, only the U-boot booting & execution is ok all the time. Kernel loading is always ok.

The following inconsistency exists in terms of the observations / results as follows:

1.  But code execution hangs most of the time showing "Starting kernel...".

2. Sometimes, even the kernel execution is initiated but code hangs showing kernel panic at different points.

3. Tried TFTP in U-boot to isolate the Micro-SD dependency. The code loading happens. But code execution hangs.


The above observation or code hang does not happen at any specific point to help backtracing. It is very random.



But the second hardware platform is tested ok for the following:

(a) Micro-SD booting. Uboot booting is always fine.

(b) Micro-SD card access (Read/write via U-boot)

(c) DDR Stress Test upto 333MHz DDR frequency (for which the hardware configuration is made)


Pls advice how to address this issue.


Looking forward for your earliest support.