On Sun, 5 Jun 2011 14:54:06 +0800 Lingfeng Xiong xionglingfeng@gmail.com 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