Sam Song writes:
Yuli> No, I used CFG_ENV_SECT_SIZE instead of CFG_ENV_SIZE. It's not Yuli> the same. BTW, the original comment mentioned "Total Size of Yuli> Environment Sector" which is not CFG_ENV_SIZE.
Sam> Ummm, CFG_ENV_SIZE is really a misleading config item. No Sam> matter how small the ENV size is, it take up one or several Sam> FLASH sectors. I have no idea when we use CFG_ENV_SIZE:-)
This is explained in details in the README.
Sam> from 0x4000 to 0x40000. Is it your flash sector size?
Yuli> Yes, it is. There are four Am29LV800BB chips so you can't have Yuli> 0x4000 bytes in sector (this would require 4KB sector on Yuli> individual flash chip while in fact the smallest sectors are Yuli> 8KB). The board is configured for high boot (don't know why Yuli> Embedded Planet designers used high boot with bottom boot Yuli> block flashes) so the U-Boot "lives" at 0xFFF00000. I put
Sam> So they produce other kind of rpxlite to work right in low boot Sam> mode with bottom boot block flashes later:-)
Do you mean the DW series?
Yuli> the environment to the next sector. The sector's size is Yuli> 4x64KB = 0x40000. With the original configuration, saveenv Yuli> must fail and it indeed failed.
Sam> Well, it failed on your rpxlite board but doesn't mean it would Sam> fail on Yoo.Jonghoon's rpxlite board:-)
Don't know. If the saveenv works OK, why to have hard-coded environment in the configuration file? Anyway, if anybody knows for what board old values are correct, I'd be happy to add appropriate #ifdefs. Maybe there are configurations using only two flash chips? In any case, new configuration should cover them all.
Yuli> Have you got an RPXlite board with different flash Yuli> configuration?
Sam> Yeah, I got one. It uses 4 AM29DL323DB90VI devices (4x8bit) in Sam> 16MB(4x4MB) and leaves the u-boot home at 0xff000000. I ported Sam> u-boot on this one and named RPXlite DW as 2.4 Linux code did.
But it's a different board family though I'm not sure having two separate ports is justified. Probably it's possible to handle the differences in the Makefile.
Sam> From your discussion, you assume there is one standard rpxlite Sam> board.
No, I don't, I work with different Embedded Planet boards and know their product range, more or less. In any case, if there are four flash chips, minimal sector size usually is 32KB unless there really is some flash with 4KB sectors. And if the U-Boot is configured for high boot (the original port is), why should the environment be placed in the middle of the flash (offset 0x8000 from the flash base)?
Sam> Actually, there are at least five different combination boards Sam> known as RPXlite CW.
Yes, but AFAIK in the case of high boot it does not matter.
Sam> So your changelog on FLASH size could use update rather than Sam> correct.
Sam> I cannot understand why CFG_RESET_ADDRESS Sam> should be set as 0x09900000.
Yuli> It can be set to any illegal address so that memory access at Yuli> this address will cause checkstop and then reset. 0x09900000 Yuli> was used on some other boards, it has no special meaning.