1 files changed, 39 insertions, 1 deletions

diff --git a/include/asm-arm/arch-ep93xx/uncompress.h b/include/asm-arm/arch-ep93xx/uncompress.h
index 4410d217077e..2171082d4fc5 100644
--- a/include/asm-arm/arch-ep93xx/uncompress.h
+++ b/include/asm-arm/arch-ep93xx/uncompress.h
@@ -16,11 +16,21 @@ static unsigned char __raw_readb(unsigned int ptr)
         return *((volatile unsigned char *)ptr);
 }
 
+static unsigned int __raw_readl(unsigned int ptr)
+{
+        return *((volatile unsigned int *)ptr);
+}
+
 static void __raw_writeb(unsigned char value, unsigned int ptr)
 {
         *((volatile unsigned char *)ptr) = value;
 }
 
+static void __raw_writel(unsigned int value, unsigned int ptr)
+{
+        *((volatile unsigned int *)ptr) = value;
+}
+
 
 #define PHYS_UART1_DATA         0x808c0000
 #define PHYS_UART1_FLAG         0x808c0018
@@ -49,5 +59,33 @@ static void putstr(const char *s)
         }
 }
 
-#define arch_decomp_setup()
+
+/*
+ * Some bootloaders don't turn off DMA from the ethernet MAC before
+ * jumping to linux, which means that we might end up with bits of RX
+ * status and packet data scribbled over the uncompressed kernel image.
+ * Work around this by resetting the ethernet MAC before we uncompress.
+ */
+#define PHYS_ETH_SELF_CTL               0x80010020
+#define ETH_SELF_CTL_RESET              0x00000001
+
+static void ethernet_reset(void)
+{
+        unsigned int v;
+
+        /* Reset the ethernet MAC.  */
+        v = __raw_readl(PHYS_ETH_SELF_CTL);
+        __raw_writel(v | ETH_SELF_CTL_RESET, PHYS_ETH_SELF_CTL);
+
+        /* Wait for reset to finish.  */
+        while (__raw_readl(PHYS_ETH_SELF_CTL) & ETH_SELF_CTL_RESET)
+                ;
+}
+
+
+static void arch_decomp_setup(void)
+{
+        ethernet_reset();
+}
+
 #define arch_decomp_wdog()