[U-Boot-Users] TFTP failure with variable block size on little endian systems
stefano babic
sbabic at denx.de
Mon Aug 20 21:25:37 CEST 2007
Hi all,
I have problems using the last version of the TFTP client. I am not
using the multicast feature (CONFIG_MCAST_TFTP is not set), but the
transfer stops after some packets, even the correct filesize is displayed.
I enabled ET_DEBUG and I have seen that the blocksize is greater that
the MTU:
Load address: 0xa0100000
Loading: send option "timeout 5"
Got OACK: timeout 5
Blocksize ack: 48133, 48133
####
done
Bytes transferred = 1836864 (1c0740 hex)
Really the transfer was not completed and only a part of the requested
file was downloaded on my board :(
I checked thetraffic with wireshark and the board sends a TFTP Read
Request with blksize=48133 (and the server does not complain, too !).
The problem is related to the code:
/* try for more effic. blk size */
pkt += sprintf((char *)pkt,"blksize%c%d%c",
0,htons(TftpBlkSizeOption),0);
We do not need the htons() call because we are simply writing into a
buffer. I changed the code into:
0,TftpBlkSizeOption,0);
and everything works again. So the problem should happen on all little
endian systems (in my case, a PXA270).
stefano
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