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...-----Original Message----- From: ecos-discuss-owner@ecos.sourceware.org [mailto:ecos-discuss- owner@ecos.sourceware.org] On Behalf Of Lambrecht Jürgen Sent: zondag 1 juni 2008 1:22 To: Andrew Lunn; I-Yanaslov Cc: ecos-discuss@sources.redhat.com Subject: RE: [ECOS] bugs in AT91 Ethernet driver
During debugging, I see that 'priv->tx_busy' stays 'true', because the TX-Complete bit (COMP of TSR reg) is never set - I also see that the TX-Used Bit Read (UBR of TSR reg) is set, which is normal I think because the TX buffers have not yet been released (because COMP is not set..). But the TX-GO bit is 0, meaning that transmit is not busy.The AT91SAM9620 has only 2 SRAMs of 4kB each. (The AT91SAM9621 has 160kB of SRAM, but no EMAC and LCD controller instead) So it will have to be the last option. To have a reliable driver, the fix is needed, but that (errata) is not why my TX does not work. The AT91SAM9620 errata is only valid at heavy network load (when there is RX and TX at the same time and then an SDRAM refresh or SDRAM bank opening or so). I only do a ping on a private network for test. And moreover, the Ethernet driver works in Redboot RAM (ok, not that well, 9% of the pings get lost).
I will further debug tomorrow...
In attachment ' if_at91_jtagram_ecos1.01.06_sg1TXsram1.txt ' with a log. It was compiled with if_at91.c patched as below. You can see that at startup a gratuitous ARP is sent out, and I receive the packet on my laptop with Wireshark. The next TX (ARP reply as reply on RX of ARP request) is sent out by the TCP/IP stack, but does not leave the board as I don't see it in Wireshark. It gets stuck somewhere. Maybe the driver is waiting on something, or maybe the TX DMA is blocked??
Regards, Juergen
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