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OMAP3503 Initialization sequence.

TSUTAMURA KOICHI
Prodigy 30 points
Other Parts Discussed in Thread: OMAP3503

 

Dear all;

We are developong a new sysytem using OMAP3503.

First we have  developed it using XOMAP3503(ES version).

Although  we have replaced XOMAP3503 by OMAP3503DCUS, it did not wrok.

1. u-boot is working normally.

2. Copying LinuxKernel to RAM by u-boot and SUM check was done normally.

3. After copying to RAM, Uncompres was done normally.

4, After jumping to EntryPoint of kernel, it seems that cpu got  hang-up and .

We guess that an initialization sequence  was changed and be needed to re-design inital operation in the kernel, however we could not understand how to change it.

Could we tell us what part  is changed?  

Best regrads.

Koichi

 

 

 

  • 0
    TI__Genius 16690 points

    Hello,

    Is silicon revision the same between XOMAP3503 and OMAP3503DCUS ? Please refer below wiki to find the silicon revision of your devices.

    http://processors.wiki.ti.com/index.php/How_to_Find_the_Silicon_Revision_of_your_OMAP35x_or_AM/DM37x

  • 0 in reply to kshin
    Prodigy 30 points


    Hello,

    After jumping to EntryPoint of kernel, it seems that cpu got hang-up. 

    As we could not read silicon revision, we could not know if silicon revision is the same between XOMAP3503 and OMAP3503DCUS.

    The following information is marking on chip:

    ES:
    XOMAP3503BCUS
    8AN005Q YB

    CS:
    OMAP3503DCUS
    9AN02DQ YB

    Does anyone have information?
     

    Best regrards.

  • 0 in reply to TSUTAMURA KOICHI
    TI__Genius 16690 points

    You can read the register from u-boot prompt before booting kernel. Please try the command shown in below link.

    http://processors.wiki.ti.com/index.php/How_to_Find_the_Silicon_Revision_of_your_OMAP35x_or_AM/DM37x#On_Linux

  • 0 in reply to kshin
    Prodigy 30 points

     

    Hello,

    Thank you for your reply.

    Using XOMAP3503BCUS, I was sure that it operated to read Silicon Version during the Linux boot process.
    After being displayed  a booting message 「Linux version 2.6.22.18-omap3...... 」, Silicon Version was read.

    However when I used OMAP3503DCUS, even the message 「Linux version 2.6.22.18-omap3...」 was NOT displayed.
      
    I guess that something has changed before being displayed, and there is a point what I should modify.

    Best regards,