Reggie 
Hi all, I've been looking at the 6410 and it's nand driver, it seems that we're in the same boat on the 6410 boards as we were on the mini210S, a binary blob and no source code, is that correct? I see the same type of s3c_nand_mlc.fo file as we've got on the mini210S, s5p_nand_mlc.fo, so I am assuming that it's the same situation. If that is the case then I think I spotted something very significant in the s3c_nand.c file in the mini210S kernel sources :) If you checkout the kernel source for the mini210 (or any of the 210 boards in fact) look in drivers/mtd/nand/s3c_nand.c and search for the following functions: s3c_nand_write_page_8bit s3c_nand_read_page_8bit s3c_nand_read_oob_8bit s3c_nand_write_oob_8bit s3c_nand_correct_data_8bit s3c_nand_calculate_hwecc_8bit s3c_nand_enable_hwecc_8bit s3c_nand_wait_encdone s3c_nand_wait_decdone s3c_nand_wait_eccbusy_8bit At first I thought these were just a set of s5pv210 specific functions for 8bit ecc, just left in there because the 16bit code was in the .fo file. They're not :) The registers are all wrong, by wrong I mean the register names are not the same, and the 3 main functions for handling 8bit aren't quite the same. I checked against the new nand drivers we have just released and a barebox 8bit nand driver, they're quite different. With that in mind, I checked the s3c6410 datasheet, as it does 8bit ecc and my hunch was correct, the 8bit functions in the s3c_nand.c code are made for the s3c6440! If you check the same s3c_nand.c file from the mini/tiny6410 kernel sources you will see that these functions do not exist in source code. If you compile a 6410 kernel from fa sources and check system.map in a text editor, search for s3c_nand and you will see all of the functions that are inside the nand binary, we have most of the same function names in the 210 s3c_nand.c code, it appears there are 5 functions that we do not have in the 210 code: s3c_nand_block_bad s3c_nand_fast_iow s3c_nand_fast_ior s3c_nand_ext_finit s3c_nand_mlc_probe the fast_io functions aren't a problem, I believe these are common functions amongst the s3c/s5p nand drivers. The same goes for the mlc_probe and the ext_finit functions, they appear to be similar enough to the s5p_nand_mlc.c functions that we wrote for it to be relatively simple to use those as a basis. Interestingly we have an 'extra' 8bit function: s3c_nand_wait_eccbusy_8bit This function is used to wait for the ecc engine to finish whatever it's doing, which is the same for the encdone/decdone functions, they're very necessary, so I can only assume that they have been handled with some simple code in the appropriate functions, or they're using the s3c_nand_wait_ functions from the s3c_nand.c code. In conclusion, I think it should be possible to transplant the s3c_nand.c functions from the 210 sources into the 6410 code and make an open source nand driver for the mini/tiny6410 boards. All of the above needs to be thoroughly checked against the datasheets, I only checked one of the 8bit functions so far but there is no other purpose for those functions in the s3c_nand.c file from the 210 sources.
