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authorStuart Menefy <stuart.menefy@st.com>2007-11-26 21:29:09 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-01-28 13:18:57 +0900
commit7a2eacb75946e0ebb81dfb36b50b5bec1c3cb50f (patch)
tree189d0cb22eab5fb566c77df6fff39e443aed19d0 /arch
parent80a68a43d90e2221599b507b6b26c3cba1957687 (diff)
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sh: Provide a 29/32-bit physical hint for bootloaders.
Shoves a magic word in to the empty_zero_page section for the bootloader to work out whether to start the kernel in 29-bit or 32-bit mode. [ Renesas CPUs already take care of the initial PMB mappings entirely in hardware and decide on 29-bit/32-bit physical depending on which pin powered up the CPU, so this is mostly for ST parts. -- PFM ]. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/sh/kernel/head_32.S6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/sh/kernel/head_32.S b/arch/sh/kernel/head_32.S
index 3338239..d67d7ed 100644
--- a/arch/sh/kernel/head_32.S
+++ b/arch/sh/kernel/head_32.S
@@ -32,7 +32,11 @@ ENTRY(empty_zero_page)
.long 1 /* LOADER_TYPE */
.long 0x00360000 /* INITRD_START */
.long 0x000a0000 /* INITRD_SIZE */
- .long 0
+#ifdef CONFIG_32BIT
+ .long 0x53453f00 + 32 /* "SE?" = 32 bit */
+#else
+ .long 0x53453f00 + 29 /* "SE?" = 29 bit */
+#endif
1:
.skip PAGE_SIZE - empty_zero_page - 1b