Pandaboard ES bootloader

jc posted @ 2012年9月01日 04:53 in Pandaboard ES , 3769 阅读

    Pandaboard ES使用SD卡作为存储介质,而非常用的NAND。它的omap4460 ROM code能够读取SD卡第一个FAT分区上的文件,因而只需把编译好的bootloader放进这个分区即可。不需要特别的烧录过程,挺方便的,但是频繁插拔卡还是有些麻烦,但是应为用的是u-boot,这个问题其实有解决的办法。

    进入正题,首先SD卡的制作过程参见:http://omappedia.org/wiki/Minimal-FS_SD_Configuration 显然omap4460 ROM code对heads、sectors一些参数是有要求的,按照里面的流程做好就行。

    然后是u-boot代码和编译了。现在u-boot主干已经支持omap4460了。

    git clone git://git.denx.de/u-boot.git

    cd u-boot

    mkdir ../build-boot

    make O=../build-boot omap4_panda_config

    make O=../build-boot

    如无意外,完成后在目录build-boot中有MLO和u-boot.img,把它们拷贝到SD卡的第一个分区中。然后把SD卡插入pandaboard,打开minicom,插上电源可看见如下信息:

Welcome to minicom 2.4

OPTIONS: I18n
Compiled on Sep  5 2010, 09:23:03.
Port /dev/ttyS0

Press CTRL-A Z for help on special keys                                     
                                                                            
                                                                            
U-Boot SPL 2012.07-00135-ge66443f (Sep 01 2012 - 20:55:40)                  
OMAP4460 ES1.1                                                              
OMAP SD/MMC: 0
reading u-boot.img
reading u-boot.img


U-Boot 2012.07-00135-ge66443f (Sep 01 2012 - 20:55:40)

CPU  : OMAP4460 ES1.1
Board: OMAP4 Panda
I2C:   ready
DRAM:  1 GiB
MMC:   OMAP SD/MMC: 0
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   No ethernet found.
Hit any key to stop autoboot:  0
reading boot.scr

** Unable to read "boot.scr" from mmc 0:1 **
reading uImage

** Unable to read "uImage" from mmc 0:1 **
 

 

    至此,pandaboard的引导部分完成,下一步是制作uImage。

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