[U-Boot-Users] [patch] MIPS: AMD Alchemy au1x00 ethernet initialization in cpu/mips/au1x00_eth.c

[Joseph Chiu]

Hi,

On u-boot bootloader 1.1.2 on AMD Alchemy Au1x00:

The au1x00_mac.c assumes that ethernet transmit always starts with transmit buffer 0.  This is not necessarily true (in the event of a warm reboot).

This little patch fixes that and prevents (reduces?) transmit timeouts that you might see when you're repeatedly warm-rebooting your board during development.

Cheers,
Joseph Chiu
www.omnilux.net


LC_ALL=C TZ=UTC0 diff -Naur u-boot-1.1.2.orig/cpu/mips/au1x00_eth.c  u-boot-1.1.2.new/cpu/mips/au1x00_eth.c 
--- u-boot-1.1.2.orig/cpu/mips/au1x00_eth.c	Fri Jan  2 15:01:32 2004
+++ u-boot-1.1.2.new/cpu/mips/au1x00_eth.c	Wed Feb 16 02:10:27 2005
@@ -167,9 +167,6 @@
 		(volatile mac_fifo_t*)(MAC0_RX_DMA_ADDR+MAC_RX_BUFF0_STATUS);
 	int i;
 
-	next_tx = 0;
-	next_rx = 0;
-
 	/* We have to enable clocks before releasing reset */
 	*macen = MAC_EN_CLOCK_ENABLE;
 	udelay(10);
@@ -186,6 +183,9 @@
 		fifo_rx[i].addr = (virt_to_phys(NetRxPackets[i]))|RX_DMA_ENABLE;
 	}
 
+        next_tx = (fifo_tx[0].addr & 0x0c )>>2;
+        next_rx = (fifo_rx[0].addr & 0x0c )>>2;
+
 	/* Put mac addr in little endian */
 #define ea eth_get_dev()->enetaddr
 	*mac_addr_high  =	(ea[5] <<  8) | (ea[4]	    ) ;