On Friday 16 May 2008, 甜瓜 wrote: > > All Walnut boards have 512k of NOR FLASH. Do you really have an original > > IBM/AMCC Walnut or a different custom 405GP board? > > Yes, my board is a custom board DHT-Walut with 32MB SDRAM and > 512k of boot flash AMD 29LV040B. Details are listed in: > http://elinux.org/DHT-Walnut
OK. > >> I wonder > >> how to build a 512KB bin? > > > > Generally this is possible. You need to change CONFIG_MONITOR_LEN & > > CFG_MONITOR_BASE in include/configs/walnut.h. And TEXT_BASE in > > board/amcc/walnut/config.mk. > > Thank you very much. That's exact what I need! Noooo! Please wait. > >> Is there any OPTION/SETTING targeting this > >> problem? Anything else > >> I should take care? > > > > But please don't forget that the environment is also stored in the NOR > > FLASH. And by changing the U-Boot size to 512k you leave no space for the > > environment. > > Do you mean that environment settings (eg: ip_addr, ethaddr...) are > stored sperately > from the bin? Most of the boards do it this way, yes. > In my mind (with guess :p), env should be defined in bin > code or data > section, and it will be compiled together with other codes to form a single > bin. This can be done too. But its not the case on Walnut. > > So why exactly do you want to change the U-Boot image size? > > Well. The reason is: > 1. Both default config of u-boot and a DHT-Walut-patched config > generate 256KB bin, > but the flash on board is 512KB. So I think I should get a 512KB bin > for flash writing. No. You definitely don't need a 512k image for this setup. You just need to flash the image at the "end" of the FLASH chip. So starting at 256k: 0...256k: Free and environment 256k...512k: U-Boot image > 2. The contents in the flash on my board is totally corrupted by > accident. It means > the important last-4-bytes should be rewritten to a proper state. > 3. Currenly, I have to use special hardware to write bin into flash. > Therefore 256KB bin > will only overwrite the first half. The last-4-bytes in the end of > flash is still the old value. > Booting will definitely fail. See above. Don't increase the image size, but flash it with an offset of 256k. Best regards, Stefan ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: [EMAIL PROTECTED] ===================================================================== ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users