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authorAlistair Popple <alistair@popple.id.au>2013-04-29 18:07:47 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-05-08 06:36:49 +1000
commit30650239adc9e4e9439256d6988e521518dccbb3 (patch)
tree2a4879c3742d62ea14dc3584988acbe0a10f6669 /arch/powerpc/kernel
parent5737789c8340620d7b542d1d4e9b197de8eb2801 (diff)
downloadop-kernel-dev-30650239adc9e4e9439256d6988e521518dccbb3.zip
op-kernel-dev-30650239adc9e4e9439256d6988e521518dccbb3.tar.gz
powerpc: Add an in memory udbg console
This patch adds a new udbg early debug console which utilises statically defined input and output buffers stored within the kernel BSS. It is primarily designed to assist with bring up of new hardware which may not have a working console but which has a method of reading/writing kernel memory. This version incorporates comments made by Ben H (thanks!). Changes from v1: - Add memory barriers. - Ensure updating of read/write positions is atomic. Signed-off-by: Alistair Popple <alistair@popple.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r--arch/powerpc/kernel/udbg.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/udbg.c b/arch/powerpc/kernel/udbg.c
index 13b8670..9d3fdcd 100644
--- a/arch/powerpc/kernel/udbg.c
+++ b/arch/powerpc/kernel/udbg.c
@@ -64,6 +64,9 @@ void __init udbg_early_init(void)
udbg_init_usbgecko();
#elif defined(CONFIG_PPC_EARLY_DEBUG_WSP)
udbg_init_wsp();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_MEMCONS)
+ /* In memory console */
+ udbg_init_memcons();
#elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC)
udbg_init_ehv_bc();
#elif defined(CONFIG_PPC_EARLY_DEBUG_PS3GELIC)
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