Hi, I am trying to use the NAND prefetch engine to speed up NAND access. In GPMC CS0 is the NAND chip. GPMC_CONFIG7_0 is set to 0x0000084c by u-boot. Hence the address for this CS should be 0x0C000000. Documentation indicates that the FIFO should be accessible in any associated chip-select region after the engine has been enabled. In linux I use ioremap() to map 0x0C000000 and use the returned pointer to access the prefetch engine FIFO. Prefetch engine is configured and started. I get FIFOEVENT interrupt from it and try to read the fifo by using this ioremap's pointer but kernel crashes with: Unhandled fault: external abort on non-linefetch (0x008) at 0xc4854000 0xc4854000 corresponds to the pointer ioremap() returned. Apparently I miss something either in HW or kernel but I cannot think of anything. Conventional access to the NAND chip through COMMAND/ADDRESS/DATA registers works ok. Any ideas would be appreciated. - Juha -- Madness takes it's toll. Please have exact change. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
