boot_prep 启动代码，用于imx2-boot_prep starting codes for imx233

its is ARM 9 SBC Designed in Eagle 5.11 with schematic. IMX233 with 64mb Ram , External boot from SD card. Compost Video and GPIO Interface with USART and UART. dual layer pcb-its is ARM 9 SBC Designed in Eagle 5.11 with schematic. IMX233 with 64mb R

uboot,支持imx233、imx28，支持从SPI、nand启动-uboot, support imx233, imx28, support from the SPI, nand start