topic Unable to handle kernel paging request for data at address 0x00000104 in T-Series

Unable to handle kernel paging request for data at address 0x00000104

athershehzad — Thu, 27 Aug 2020 12:14:53 GMT

I am working on a custom board based on T1042. I have use on board DDR3L discrete RAM in my design. I have successfully flashed U-BOOT, RCW, DTB, kernel and file-system in the NOR flash. When the board boots up, it is crashing at a point where file-system is being loaded to RAMDISK.

I have generated RAM's timing parameters through codewarrior DDRV Tool and used those parameters in my uboot.

When I check my RAM through mtest command in UBOOT, it always fails. But when I write some data on the RAM through mw (memory write) command and read it back by md (memory read) command, I found the same data that I have written on the memory.

I have attached kernal logs for the case when it crashes. Kindly help me to get rid of this error.

Re: Unable to handle kernel paging request for data at address 0x00000104

yipingwang — Fri, 28 Aug 2020 06:33:03 GMT

Hello Ather Shehzad,

Please use QCVS DDRv tool to do validated and optimization.

Please execute "Centering the clock", "Read/Write ODT and driver" validation and Operational DDR test.

Please refer to DDR Controller Configuration on LS2085/LS2080 Bringing up and QCVS DDRv user manual https://www.nxp.com/docs/en/user-guide/QCVS_DDR_User_Guide.pdf .

Thanks,

Yiping

Re: Unable to handle kernel paging request for data at address 0x00000104

athershehzad — Fri, 28 Aug 2020 07:11:44 GMT

I had already used DDR timing values that are generated by QCVS DDRv tool.

When I test my memory through mtest command, the memory test always fails

and gets exactly opposite of what is expected. For example it gets

0xFFFFFFFF while expected 0x00000000. However when I test my memory through

mw command and read through md command in UBOOT, I always read what I

had written.

Regards

Ather

Re: Unable to handle kernel paging request for data at address 0x00000104

yipingwang — Fri, 28 Aug 2020 08:28:43 GMT

Hello Ather,

Can you pass "Operational DDR test" in your DDRv project?

Thanks,

Yiping

Re: Unable to handle kernel paging request for data at address 0x00000104

athershehzad — Fri, 04 Sep 2020 10:10:12 GMT

Helo Yiping,

I ran Operational DDR Test in a DDRv project. I am attaching the screen shots of the results. Can you suggest any solutions by looking at the screen shots? What do these results mean?

Can you please explain the working of these tests ?

What is the description of these tests?

Regards,

Ather

Re: Unable to handle kernel paging request for data at address 0x00000104

yipingwang — Tue, 08 Sep 2020 07:34:14 GMT

Let's continue to discuss you problem in https://community.nxp.com/t5/CodeWarrior-for-QorIQ/DDR-Validation-Tool-Tests-Description/td-p/1147705.

Re: Unable to handle kernel paging request for data at address 0x00000104

athershehzad — Wed, 09 Sep 2020 10:28:44 GMT

OK.

Please tell the description of the tests if you know. And what does these results show ?

Re: Unable to handle kernel paging request for data at address 0x00000104

yipingwang — Fri, 11 Sep 2020 03:39:43 GMT

Please refer to the description in https://community.nxp.com/t5/CodeWarrior-for-QorIQ/DDR-Validation-Tool-Tests-Description/td-p/1147705