[PATCH] of: support passing console options with stdout-path
andrew at lunn.ch
Mon Nov 24 15:00:16 PST 2014
On Mon, Nov 24, 2014 at 10:23:58PM +0000, Leif Lindholm wrote:
> Support specifying console options (like with console=ttyXN,<options>)
> by appending them to the stdout-path property after a separating ':'.
> stdout-path = "uart0:115200";
> This patch also modifies of_find_node_by_path() to match only the
> portion of the path before a ':'.
These appears to somewhat conform to ePAPR, which says:
A string that specifies the full path to the node representing
the device to be used for boot console output. If the character
":" is present in the value it terminates the path.
So you can put any random junk after the :. However, are we going to
have backward/forward compatibility problems, and problems with
bootloaders? The current kernel code does not look for the :. So a new
DT blob on an old kernel will not work so well.
More worrying, barebox does not support the : either. So there is a
danger your bootloader suddenly goes silent after a dt blob update.
Would it be safer to add a new property in chosen?
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