topic Re: linux porting in i.MX Processors

linux porting

saida — Wed, 11 Oct 2017 08:46:17 GMT

I have a customized imxdl hardware board where extra devices are added and pin muxing also different from sabresd board

i am able to port u-boot,linux kernel and rootfile system with sabresd board which i purchased

in my custom board i am using uart3 and i chaned it in u-boot UART3_BASE ans CONSOLE is ttymxc2

so u-boot is working but kernel is not booting (i am using imx6dl-sabresd.dtb file for kernel booting which is in kernel)

it is stopping at 'Starting Kernel'

no further console messages

what could be the problem

thanks and regards

saida

Re: linux porting

b36401 — Fri, 13 Oct 2017 04:45:50 GMT

You need to update u-boot options with new console and make sure that Linux kernel itself supports it.

Have a great day,
Victor

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Re: linux porting

jingyangxie — Fri, 13 Oct 2017 09:29:12 GMT

Hi,Saida S

Have you configed the gpio for uart3 correctly in the dts?if so ,you can do the test(communicate with the PC by read/write the uart)

Re: linux porting

saida — Mon, 16 Oct 2017 16:21:48 GMT

Thank you for your replay

I changed gpio pins for UART 3 in dtsi file and it is updated in dtb file after build also

But still it's not working. Where this UART 3 initialized in Linux ? I am debugging through source code also , if you have any clues plZ share it i will try and come back to you

Thank you very much

Regards

Saida

Re: linux porting

jingyangxie — Tue, 17 Oct 2017 07:21:59 GMT

the whole uarts will be initialized when enabled in dts.for imx,the uart driver is in /driver/tty/serial/imx.c.you can refer the file for details.or can you give the start massage of your board?I want to know more details.

Re: linux porting

saida — Thu, 19 Oct 2017 17:03:06 GMT

Ok i will send it to you soon

Byee