[U-Boot] problems with tftp

[Massimiliano Cialdi]

I'm tring to get a 53MB file using tftp protocol.
I use U-Boot 1.1.4 that was preinstalled on OMAP3EVM board. PC side is a
linux box (ubuntu 9.04) where is installed atftpd 0.7 that runs with the
following command line (not using inetd):

/usr/sbin/atftpd --daemon --tftpd-timeout 300 --retry-timeout 5
--mcast-port 1758 --mcast-addr 239.239.239.0-255 --mcast-ttl 1
--maxthread 100 --verbose=5 /opt/OMAP35x_SDK_0.9.7

where /opt/OMAP35x_SDK_0.9.7 is the directory where are placed all files
(obviously all permission are correctly set)

On U-Boot I run the following command:
tftpboot 0x81600000 bin/<file>.jffs2
(network is correctly set)

I tried with 2 files: rootfs.jffs2 (about 17MB) and myroot.jffs2 (about
53MB)

trying rootfs.jffs2 all works, it is correctly transfered.

instead myroot.jffs2 doesn't work. atftd log report the following line:
Jan 27 09:24:33 lab7 atftpd[5910]: Serving bin/myroot.jffs2 to
192.168.1.203:2082
Jan 27 09:24:33 lab7 atftpd[5910]: Requested file to big, increase
BLKSIZE

How can I increase BLKSIZE, and where? Is a client or server parameter?

thanks