I thought the whole point of using this linux and u-boot stuff was that whatever you did, someone else had done it first and you just had to copy them.
Well I've been caught out :-)
I want to ditch using the uSD card at all on our AVR32 board , and use NAND where we have been using uSD.
I have a Linux JFFS2 disk working out of NAND - quite easy as Linux pretty much knew how, once you told it you had a chip.
But the u-boot seems to have no clue about NAND on the AVR32 - it doesn't set up the hardware to get to it at all, and there's no code set up in the target board header and code files for any AVR32-based board, as far as I can see!!!
I did pull the latest files, but I couldn't spot any relevant additions.
I have found some stuff in support for other Atmel devices, which seems relevant.
I'm totally in the dark about what u-boot can or should do with ecc .....
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So far I've worked out that I've got to
1. in cpu.c add set up MODE3, CYCLE3, SETUP3, PULSE3 registers for cs3 timing.
2. in <target>.c/board_early_init_f add hmatrix_slave_write call to enable nand in ebi
3. in <target>.c/board_early_init_f set up chip select(s) and busy(s) in the GPIO setup to point the right way, and initially turn everything off
4 in <target>.h
#undef CONFIG_NAND_LEGACY
#define CONFIG_CMD_NAND #define CONFIG_JFFS2_NAND #define CFG_MAX_NAND_DEVICE #define NAND_MAX_CHIPS #define CFG_NAND_BASE 0x0c000000
I'm still pretty woolly about these though
CONFIG_MTD_NAND_VERIFY_WRITE CONFIG_MTD_PARTITIONS
And I may have missed other compulsory settings
5. create a file called nand.c in the same directory as my <target>.c - I've based mine on the one for the at91sam9261ek. This needs to implement
board_nand_init which must set up service routines cmd_ctrl to alter ALE,CLE etc dev_ready to read the "chip ready" status chip_delay - no idea! I note that there are a couple of other entries in the nand_chip that are marked "BOARDSPECIFIC" which I don't set up myself... but I can't see anyone else doing it either!
So far I've no clue how the nand.c file gets included in the make of u-boot - is it automatic, or do I need to edit a makefile?