hi, > Once you have a working NAND, you can replace the NOR image, switching > back to NAND if the new NOR image is broken. > > And of course be careful not to write to the wrong flash, and destroy your > backup boot source.
Thanks for your help. Now I have already wrote the newer version of u-boot into NAND Flash and boot from it! Do you mind me to ask some more questions? Where is environment stored? If I save the NAND-version u-boot's environment, will it overwrite the one of NOR-version u-boot? Thanks. On 100/6/7 上午 02:50, Scott Wood wrote: > On Sun, 5 Jun 2011 14:54:06 +0800 > Lingfeng Xiong<[email protected]> wrote: > >> hi there, >> I bought a Freescale MPC8313E-RDB some days before. The version of >> u-boot on that board is quite old and I wanna run a newer one. I have >> already built the latest git version of u-boot for that board. But I >> found there are several configuration files: >>> MPC8313ERDB_33 powerpc mpc83xx mpc8313erdb >>> freescale - MPC8313ERDB:SYS_33MHZ >>> MPC8313ERDB_66 powerpc mpc83xx mpc8313erdb >>> freescale - MPC8313ERDB:SYS_66MHZ >>> MPC8313ERDB_NAND_33 powerpc mpc83xx mpc8313erdb >>> freescale - MPC8313ERDB:SYS_33MHZ,NAND_U_BOOT >>> MPC8313ERDB_NAND_66 powerpc mpc83xx mpc8313erdb >>> freescale - MPC8313ERDB:SYS_66MHZ,NAND_U_BOOT >> >> My board is Rev C and all switches are in factory default, could you >> tell me which configuration should I use? > > MPC8313ERDB_33 is for booting from NOR, which is the default. > > The "66" targets are for an earlier version of the board that had a 66MHz > crystal rather than 33MHz. > >> For I have no USBTAP, there are no way for me to flush either NOR Flash >> or NAND Flash, so I am afraid if I install my u-boot to NOR Flash and >> that u-boot cannot run correctly, my board would be unavailable. > > Your best option is probably to build MPC8313ERDB_NAND_33, and put it in > NAND flash. Then you can change the board switches to boot from NAND, and > if it doesn't work, switch them back to NOR which you've left unmodified. > > Once you have a working NAND, you can replace the NOR image, switching > back to NAND if the new NOR image is broken. > > And of course be careful not to write to the wrong flash, and destroy your > backup boot source. > > -Scott > > _______________________________________________ > U-Boot mailing list > [email protected] > http://lists.denx.de/mailman/listinfo/u-boot > _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
