In message 447d42b2.45c5968f.442a.ffff9351@mx.gmail.com you wrote:
I try to make u-boot work on my board which is similar with OMAP5912OSK. But the flash we using is 28F256J3C. I have already added 28F256J3C's manufacture code and device id in the proper position of u-boot. But there are several questions I can't figure out.
Any reason for not using the CFI driver?
- How many sectors does 28F256J3C have? 256 or 259? How to divide 259
sectors in OSK which have two 16M flash.
How about reading the chip manual?
- What's the meaning of "Internal FLASH identification codes" in flash.h
file. It defines like this:
How about reading the comments in this file:
/*----------------------------------------------------------------------- * Internal FLASH identification codes * * Be careful when adding new type! Odd numbers are "bottom boot sector" types! */
But I can't find this kind of information on 28F256J3C's datasheet. And what the code should be in 28F256J3C?
Do you really expect to find U-Boot internal information in the chip manual? I'm afraid we are not *that* prominent yet.
- Should I modify the read manufacture and device id command? I have some
trouble with the following codes: /* Write auto select command: read Manufacturer ID */ addr[0x5555] = (FPW) 0x00AA00AA; addr[0x2AAA] = (FPW) 0x00550055; addr[0x5555] = (FPW) 0x00900090;
Probably this is not the command sequence expected by your flash chips. Please read the chip manual.
Best regards,
Wolfgang Denk