powerpc: udbg-based backend for hvc_console

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This adds a new backend for the hvc console based on the low-level
udbg callbacks.  This effectively implements a working runtime console
in terms of the simple udbg primitives.  This is kind of a hack -
since udbg isn't something you really want to be using routinely - but
it's really useful during bringup.

This can be used to quickly implement a userspace-usable console while
you're working on a proper driver for whatever console I/O device the
hardware has.  Or, it can be used to avoid writing a full blown
tty/console driver entirely for quick-and-dirty I/O hardware that will
later be replaced by something else.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

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David Gibson 2008-11-05 14:20:17 +00:00 • committed by Paul Mackerras

parent 8c6531868d

commit d5e5491343

3 changed files with 103 additions and 0 deletions

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6

drivers/char/Kconfig

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1

drivers/char/Makefile

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96

drivers/char/hvc_udbg.c

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