Hello, I have been experiencing VERY slow TFTP speeds using the Realtek RTL8111GS-CG Ethernet chipset. The board I am using is a Minnowboard Max (revision A2) and the version of U-Boot is 2015.10-rc3.
After booting the board into the U-Boot command prompt I set the envs 'ipaddr' and 'serverip' and run the command 'tftp 0x3000000 <my file>'. The file is downloaded at 700-800 KiB/s, even though the board is directly connected to my laptop and the link speed is 100 Mbs (courtesy of ethtool). Performing the same test but with the board and laptop connected to a switch doesn't change the transfer speed. Enabling DEBUG_RTL8169 in drivers/net/rtl8169.c results in the following error message being displayed: eth_rtl8169: 1000Mbps Full-duplex operation, TBI Link Failed! Attempting to force gigabit speeds in the uboot driver results in a TFTP download rate of up to 1.5 MiB/s, and ethtool shows a link speed of 1000Mbps. Looking at the rtl8111 PHY status register I can see that the ethernet chip also thinks it is in a full duplex, 1000Mbps connection. Forcing the chip to 100Mbit (half and full duplex) results in transfer rates of 700-800 KB/s.Looking at the actual packets sent during the TFTP session shows no large number of missed packets, retries etc.; nothing unusual. After booting the board into Linux I am able to establish a 1 gigabit connection and achieve transfer rates of over 100 MB/s, so its most likely something to do with U-Boot's rtl8169 driver not setting up the chip correctly. I would greatly appreciate if someone with more experience in this field can look into this; it is likely that this issue affects multiple Realtek Ethernet chipsets. Lastly, creating a ROM with an invalid (blank) vga.bin increases TFTP speeds to 2.4 MB/s; which is completely counterintuitive. Please let me know if I can be of any help, I would really like to get to the bottom of this. -Mike _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
