Thank for your reply.
I am sorry that I make some confusion between "xterm" and "shell" (By the way, my english is so poor). In fact, hush in U-Boot calls function "readline" (like that bash may use GNU readline library) to handle I/O and implement terminal-extension, right? While terminal (usually serial driver in U-Boot) is a minimal subset to drive I/O devices, readline can do more like command history expansion and cmdline editing. My patch just modifys "readline" function to use vivi's extension codes, which also means that it just consider one line not a complete hush sentence (like "if...then...fi") as one history item. However, I think, it is useful enough.
About the nand subsystem, I am glad to hear that there exists one fresh driver branch. It makes sense to every user, I think. Because nor flash always works as BOOT rom, while nand flash always works as DATA rom. In my embedded project, I cannot do anything without a usable nand driver because the nor flash chip is 1MB while the nand flash chip is 64MB on my board. Where to place my kernel and the huge root filesystem? :-)
I will submit the three patches soon.
Best regards,
luo.jinhua