[U-Boot] Ask: How speed up read nand flash on lpc3250

[xbl1986]

CPU:LPC3250.
Nand:K9F2G8U0A 256M
the u-boot boot time now about 8s.
the step to read linux kernel less 2M cost more or less 4s!!
I want to make it faster~,but don't know how to.
I try to change the memcpy function.but it's works not very well.
so i want to via the maillist to find some help.
thank you~~.
                                             --wizard