On 20:13 Mon 04 May , Matthias Kaehlcke wrote:
hi,
i'm trying to do a forward port of the out of tree patches for the kwikbyte kb9202b. my board is booting and detects the nand flash, but only in certain circumstances.
I've never test the nand on rm9200 as the rm9200ek does not have it but I'll try this
the hwcontrol function looks like this:
#define KB9202_NAND_NCE ((unsigned int)1 << 28) /* EN* on D28 */
unsigned int is not needed
static void kb9202_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) { ...
if (ctrl & NAND_NCE) AT91C_BASE_PIOB->PIO_CODR = KB9202_NAND_NCE;
try writel(KB9202_NAND_NCE, AT91C_BASE_PIOB->PIO_CODR);
else AT91C_BASE_PIOB->PIO_SODR = KB9202_NAND_NCE;
and writel(KB9202_NAND_NCE, AT91C_BASE_PIOB->PIO_SODR);
... }
the problem is that for some reason the enable signal isn't generated when using the pre-processor constant KB9202_NAND_NCE. on the other hand it is generated when using ((unsigned int)1 << 28), instead of the define. it took me some hours to figure this out ...
Best Regards, J.