[U-Boot,10/10] MIPS: start.S: emulate REVISION register for qemu-malta

Message ID 1358960705-25559-11-git-send-email-juhosg@openwrt.org
State Superseded
Delegated to: Daniel Schwierzeck
Headers show

Commit Message

Gabor Juhos Jan. 23, 2013, 5:05 p.m.
On the origial Malta boards the REVISION register is
accessible at the 0x1fc00010 address. The contents of
this register gives information about the revision
of the Malta and Core Boards.

This register is used by the Linux kernel to identify
the actual board it is running on. However the register
is not emulated properly by Qemu, so put a hardcoded
value into the flash to make Linux work.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
Changes since RFC: ---
 arch/mips/cpu/mips32/start.S |    6 ++++++
 1 file changed, 6 insertions(+)


diff --git a/arch/mips/cpu/mips32/start.S b/arch/mips/cpu/mips32/start.S
index 9c1b2f7..7b42716 100644
--- a/arch/mips/cpu/mips32/start.S
+++ b/arch/mips/cpu/mips32/start.S
@@ -78,6 +78,12 @@  _start:
 	.word 0x00000000
+#elif defined(CONFIG_QEMU_MALTA)
+	/*
+	 * Linux expects the Board ID here.
+	 */
+	.word 0x00000420	# 0x420 (Malta Board with CoreLV)
+	.word 0x00000000