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] ) ;