topic Re: Linux 3.0.35 for iMX53 in i.MX Processors

Re: Linux 3.0.35 for iMX53

SergeVShistarev — Mon, 01 Apr 2013 09:05:56 GMT

Hi,

We're developing custom board based on IMX53QSB. Kernel 2.5.35 from LTIB works fine. u-boot from LTIB works fine.

Even u-boot from git works fine (and with 1Ghz clock).

Linux kernel 3.8.2 compiles with imx_v6_v7_defconfig, but hangs up on device. And I can't understand why: load address? Entry point? DRAM setting (but it's U-boot's work)?

Can you public you .config or at least .diff from imx_v6_v7_defconfig?

Re: Linux 3.0.35 for iMX53

rogerio_silva — Mon, 01 Apr 2013 13:15:58 GMT

Hi Serge,

I tested the Stable: 3.8.5 on i.MX53QSB and it's booting. I'm using the imx_v6_v7_defconfig as you mentioned.

Please, take a look on https://community.freescale.com/docs/DOC-1604 - Section "Building Kernel Mainline"

and check if you're missing any step.

Rgds

Rogerio

Re: Linux 3.0.35 for iMX53

SergeVShistarev — Mon, 01 Apr 2013 15:54:20 GMT

Hi Rogerio,

Many thanks for link. I wonder how I skip it.

Re: Linux 3.0.35 for iMX53

goodvibr — Wed, 03 Apr 2013 14:01:42 GMT

Hi Rogerio,

As I need to use the PREEMPT_RT patches [1], I am currently looking at two options for the i.MX51 platform:

Either use a mainline 3.8.4 (or one of a few available earlier versions) kernel with the official PREEMPT_RT patches
Or try a modified [2] 2.6.31-imx

I would prefer to use a mainline 3.8.4 kernel. So, have you experienced or do you know of any obvious problems with that version (e.g. basic features or hardware that is not supported)?

[1] Index of /pub/linux/kernel/projects/rt

[2] Real-Time patch on iMX51

Re: Linux 3.0.35 for iMX53

rogerio_silva — Wed, 03 Apr 2013 20:20:37 GMT

Hi Goodvibr,

Sorry but I'm not familiar with PREEMPT_RT patches.

The kernels from Freescale are more complete in terms of i.MX drivers, but I don't think you will have problems if you choose mainline kernel. You will have to check if kernel mainline has all features you need.

Rgds,

Rogerio

Re: Linux 3.0.35 for iMX53

fabio_estevam — Thu, 04 Apr 2013 01:01:36 GMT

You can reference mx51evk device tree code to check what is currently supported in 3.8.5:

https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/arch/arm/boot/dts/imx51-babbage.dts?id=refs/tags/v3.8.5

Regards,

Fabio Estevam