[MIPS] Malta: Handle byteswapping hardare bug in big endian mode.
The SOC-it system controller running in big endian mode might forget
byteswapping when DMAing to the last word of physical memory. Fixed by
ignoring the last page of memory.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/mips-boards/generic/memory.c b/arch/mips/mips-boards/generic/memory.c
index bc4d093..fd49256 100644
--- a/arch/mips/mips-boards/generic/memory.c
+++ b/arch/mips/mips-boards/generic/memory.c
@@ -76,6 +76,15 @@
memsize = simple_strtol(memsize_str, NULL, 0);
}
}
+
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ /*
+ * SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
+ * word of physical memory
+ */
+ memsize -= PAGE_SIZE;
+#endif
+
memset(mdesc, 0, sizeof(mdesc));
mdesc[0].type = yamon_dontuse;