EVB: Smart Device Evaluation Board
Uboot Version: 2017.03-00001-ga2fea67-dirty
Chip : i.MX6S
1. IOMUX setting
static iomux_v3_cfg_t const ecspi4_pads[] = {
MX6_PAD_EIM_D21__ECSPI4_SCLK | MUX_PAD_CTRL(SPI_PAD_CTRL),
MX6_PAD_EIM_D22__ECSPI4_MISO | MUX_PAD_CTRL(SPI_PAD_CTRL),
MX6_PAD_EIM_D28__ECSPI4_MOSI | MUX_PAD_CTRL(SPI_PAD_CTRL),
MX6_PAD_EIM_D20__GPIO3_IO20 | MUX_PAD_CTRL(NO_PAD_CTRL),
};
2. CS signal
#define CONFIG_SF_DEFAULT_BUS 3 //include/configs/mx6sabre_common.h
static void setup_spi(void)
{
imx_iomux_v3_setup_multiple_pads(ecspi4_pads, ARRAY_SIZE(ecspi4_pads));
gpio_request(IMX_GPIO_NR(3, 20), "ECSPI4 CS");
}
int board_spi_cs_gpio(unsigned bus, unsigned cs)
{
return (bus == 3 && cs == 0) ? (IMX_GPIO_NR(3, 20)) : -1;
}
3. CCM enable
After these settings above, all signals(CS, CLK, MISO, MOSI) can be detected.
When execute 'sf probe' command in uboot, the terminal shows:
SF: unrecognized JEDEC id bytes: 00, 00, 00
Failed to initialize SPI flash at 3:0
Do I miss something?
How could I figure this out, hope you guys can give some advise, thanks in advance!
Best
