MIPS: Loongson: Add a machtype kernel command line argument

The difference between some loongson-based machines is very small, so, if
there is no necessary to add new kernel config options to cope with this
difference, it will be better to share the same kernel image file between
them, benefit from this, the linux distribution developers only have a need
to compile the kernel one time.

This machtype kernel command line argument will be used later to share the
same kernel image file between two different machines(menglong & yeeloong)
made by lemote.

Thanks very much to Zhang Le for cleaning up the machtype implementation.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4c12a290bee5..f45d0d8e71d8 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1286,6 +1286,10 @@ and is between 256 and 4096 characters. It is defined in the file
                         (machvec) in a generic kernel.
                         Example: machvec=hpzx1_swiotlb
 
+        machtype=       [Loongson] Share the same kernel image file between different
+                         yeeloong laptop.
+                        Example: machtype=lemote-yeeloong-2f-7inch
+
         max_addr=nn[KMG]        [KNL,BOOT,ia64] All physical memory greater
                         than or equal to this physical address is ignored.