MIPS: malta: Configure Segment Control registers for EVA boot
The Malta board aliases 0x80000000 - 0xffffffff to 0x00000000
- 0x7fffffff ignoring the 256 MB IO hole in 0x10000000.
The physical memory is shifted to 0x80000000 so up to 2GB
can be used. Kuseg is expanded to 3GB (due to board limitations
only 2GB can be accessed) and lowmem (kernel space) is expanded to 2GB.
The Segment Control registers are programmed as follows:
Virtual memory Physical memory Mapping
0x00000000 - 0x7fffffff 0x80000000 - 0xfffffffff MUSUK (kuseg)
0x80000000 - 0x9fffffff 0x00000000 - 0x1ffffffff MUSUK (kseg0)
0xa0000000 - 0xbf000000 0x00000000 - 0x1ffffffff MUSUK (kseg1)
0xc0000000 - 0xdfffffff - MK (kseg2)
0xe0000000 - 0xffffffff - MK (kseg3)
The location of exception vectors remain the same since 0xbfc00000
(traditional exception base) still maps to 0x1fc00000 physical.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
diff --git a/arch/mips/mti-malta/malta-setup.c b/arch/mips/mti-malta/malta-setup.c
index 01a55f3..405ff85 100644
--- a/arch/mips/mti-malta/malta-setup.c
+++ b/arch/mips/mti-malta/malta-setup.c
@@ -247,6 +247,10 @@
{
unsigned int i;
+ if (config_enabled(CONFIG_EVA))
+ /* EVA has already been configured in mach-malta/kernel-init.h */
+ pr_info("Enhanced Virtual Addressing (EVA) activated\n");
+
mips_pcibios_init();
/* Request I/O space for devices used on the Malta board. */