The wiki document says
Code:
_MPC824X > setenv ipaddr 192.168.0.106
_MPC824X > setenv serverip 192.168.0.5
_MPC824X > setenv netmask 255.255.255.0
_MPC824X > tftpboot 0x1000000 altboot.bin
In the screenshot of your attempt to load the altboot utility you forgot to use the hexadecimal specifier :
0x
You used
1000000 while it should have been
0x1000000
PS Sorry, it seems that
1000000 has been interpreted correctly as
0x1000000 
Don't know how to troubleshoot the tftpboot hangup. If you have a serial line connection you could use the alternative method with Kermit to load
altboot