Hello everybody!
I develop a driver for configuring GPMC to communicate with a FPGA, as a NOR device. I'm running an emulation on QEMU without the NOR.
It seems that I configured everything, registered the device and am able to write to it without errors like:
int addr = 0x00300000;
void __iomem* start = ioremap(nor_resource.start, FLASH_SIZE_SDPV2); //128Mb
void __iomem* ioaddr = start + addr;
gpmc_base = ioremap(0x6e000000, FLASH_SIZE_SDPV2);
err = nor_init(sdp_nor_partitions, ARRAY_SIZE(sdp_nor_partitions), CS);
__raw_writeb(val, ioaddr);
I've set all mux modes to 4: echo 0x4 > /sys/kernel/debug/omap_mux/gpmc_a1
Exported all GPIOs by looking at "cat gpmc_a1":
name: gpmc_a1.gpio_34 (0x4800207a/0x04a = 0x0004), b n4, t ac15
mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE4
signals: gpmc_a1 | NA | NA | NA | gpio_34 | NA | NA | safe_mode
mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE4
signals: gpmc_a1 | NA | NA | NA | gpio_34 | NA | NA | safe_mode
In this case 34.
But when running the gpio monitor from http://wiki.gumstix.org/index.php?title=GPIO_Event_Driver and requesting a write, I see no changes on address lines.
What am I doing wrong?
Many thanks,
Bill