FAQ: how to enable the serial to get kernel booting messages

FAQ: how to enable the serial to get kernel booting messages

Imagen de Dexuan Cui (Intel)
Dexuan Cui (Intel)
Mar, 27/03/2012 - 19:57

Yocto Linux running on the EDSC-2012 ZLG board doesn't output booting messages to the serial by default.

We can pass such kernel parameters to the kernel "earlyprintk=serial,0xE070,115200,keep
console=tty0 console=ttyPCH0 ignore_loglevel (e.g., passing this to the syslinux loader -- this needs to modify the "APPEND ..." line inthe syslinux.cfg file) to enable the serial to output the messages.

This can be useful for debugging kernel module, too.

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Imagen de songjun54cm
songjun54cm
Vie, 20/04/2012 - 07:10

there are two serial port on the develop platform, which port does your method sepicify?

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Imagen de Dexuan Cui (Intel)
Dexuan Cui (Intel)
Vie, 18/05/2012 - 02:10

I mean the first one. You can try them one by one to find which one is the PCH0. If you add "console=ttyPCH1" in the kernel parameter, the 2nd one should work, too.

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