[U-Boot-Users] has someone run u-boot in mipssim?

because our soc is not available now, i want to run u-boot in mipssim to verify my modification on cpu/start.S and board/xxx/lowlevel_init.S. but the u-boot compiled by eldk seems to run not correctly in mipssim.and if i modify the CROSS_COMPILE as sde-, it shows error as "can't find mips-linux-as". so i wonder is there someone has run u-boot in mipssim and with which toolchain?