Dear Wolfgang,
Thank you for your answer. I understand that it is best to use the latest version of u-boot and linux kernel but the pair u-boot 1.2.0 and linux 2.6.23 I can relay on. I have already tried in the past u-boot 1.3.4 and kernel 2.6.29 and I had the problem to get the IP address using the DHCP server (on the u-boot level). I have given up with the newer version of u-boot and I am still using this what works for me. (This is however a different subject)
As regards the limitation of 8MB I have done some experiments and it seems to be that it is not a problem any more. I have described that under the link:
http://www.nabble.com/U-boot-and-linux-command-line-parameters-td23698384.ht...
Basically the CFG_BOOTMAPSZ could be set to 16 MB: #define CFG_BOOTMAPSZ (8 << 21) /* 16 MB */
Best Regards
Mirek