[U-Boot] Second serial port access ...

[U-Boot] Second serial port access ...

[Robert Sciuk]

I'm attempting to extend u-boot to request some IPMI information from a
BMC attached to a uart, and was wondering how best to approach the
problem.  My first concern is whether to add "cmd" type code or use the
u-boot API, and the second concern, is to how to configure and access
the 2nd serial port?  My intent is to query the bmc on the serial port,
and then add a node to the FDT (/chosen{}) in order to pass information
to the Linux kernel.  Has something like this been done?  Is there a
better approach?  Have I overlooked something obvious?  Sorry for the
nubie question.

 

Robert Sciuk

Senior Designer, R&D.

905.738.3741 xt 2233.

 

[U-Boot] Second serial port access ...

[Mike Frysinger]

On Friday, April 29, 2011 11:23:10 Robert Sciuk wrote:
> I'm attempting to extend u-boot to request some IPMI information from a
> BMC attached to a uart, and was wondering how best to approach the
> problem.  My first concern is whether to add "cmd" type code or use the
> u-boot API, and the second concern, is to how to configure and access
> the 2nd serial port?  My intent is to query the bmc on the serial port,
> and then add a node to the FDT (/chosen{}) in order to pass information
> to the Linux kernel.  Has something like this been done?  Is there a
> better approach?  Have I overlooked something obvious?  Sorry for the
> nubie question.

i think you want CONFIG_SERIAL_MULTI.  this way you can set 
stderr/stdin/stdout to a different serial device on the fly.
-mike
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