Hi Simon,
On 21.10.2011 15:08, Simon Schwarz wrote:
Another thing just poped into my mind, ATM I have a DMA patch for devkit8000 on the ML: http://article.gmane.org/gmane.comp.boot-loaders.u-boot/109744 http://article.gmane.org/gmane.comp.boot-loaders.u-boot/112661
It speeds up the process of copying the u-boot/linux image. ATM this is in combination with HW ecc and I doubt that it will work seamlessly with SW-ecc, yet. However IMHO DMA in combination with SW-ecc could be nearly as fast as using HW-ecc.
So maybe an adaption is worth a try?
Ok, I've finally taken a look at it. Adaption is very straight forward actually. This works for me:
diff --git a/drivers/mtd/nand/nand_spl_simple.c b/drivers/mtd/nand/nand_spl_simple.c index 1402a35..1248f8f 100644 --- a/drivers/mtd/nand/nand_spl_simple.c +++ b/drivers/mtd/nand/nand_spl_simple.c @@ -284,7 +284,8 @@ static int nand_read_page_dma(int block, int page, void *dst) for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) { res += omap3_dma_conf_transfer(0, nand_chip.IO_ADDR_R, (uint32_t *)p, CONFIG_SYS_NAND_ECCSIZE/4); - this->ecc.hwctl(&mtd, NAND_ECC_READ); + if (this->ecc.mode != NAND_ECC_SOFT) + this->ecc.hwctl(&mtd, NAND_ECC_READ); res += omap3_dma_start_transfer(0); /* correct ecc from former transfer */ if (ecc_wait.valid != 0)
Regards, Ilya.