From ebf71ec7e14bd55d0114f625686304979ecff4d0 Mon Sep 17 00:00:00 2001
From: Alban Bedel <albeu@free.fr>
Date: Fri, 7 Nov 2014 12:44:36 +0100
Subject: [PATCH] MIPS: ath79: Read the initrd address from the firmware
 environment

Allow loading an initrd passed by the firmware.

Signed-off-by: Alban Bedel <albeu@free.fr>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8354/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
 arch/mips/ath79/prom.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/mips/ath79/prom.c b/arch/mips/ath79/prom.c
index 80a0bffe5e1c..e1fe63051136 100644
--- a/arch/mips/ath79/prom.c
+++ b/arch/mips/ath79/prom.c
@@ -13,6 +13,7 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/string.h>
+#include <linux/initrd.h>
 
 #include <asm/bootinfo.h>
 #include <asm/addrspace.h>
@@ -23,6 +24,13 @@
 void __init prom_init(void)
 {
 	fw_init_cmdline();
+
+	/* Read the initrd address from the firmware environment */
+	initrd_start = fw_getenvl("initrd_start");
+	if (initrd_start) {
+		initrd_start = KSEG0ADDR(initrd_start);
+		initrd_end = initrd_start + fw_getenvl("initrd_size");
+	}
 }
 
 void __init prom_free_prom_memory(void)