Hi, On a custom i.MX28 board I am using u-boot-2015.01. The debug port DUART is not the same as i.MX28, so I changed these settings in iomux.c:
const iomux_cfg_t iomux_setup[] = { /* DUART */ // MX28_PAD_PWM0__DUART_RX, // MX28_PAD_PWM1__DUART_TX,
/* DUART */ /* Unconfigure BOOT ROM default DUART */ MX28_PAD_PWM0__GPIO_3_16, MX28_PAD_PWM1__GPIO_3_17, /* Configure DUART on alternate pins */ MX28_PAD_I2C0_SCL__DUART_RX, MX28_PAD_I2C0_SDA__DUART_TX,
I enabled #define CONFIG_SPL_SERIAL_SUPPORT and built uboot with : make u-boot.sb At last I can program the board only using MfgTools or 'mxsldr', or it seems working. The problem is that I get no messages on output debug port or some random chars every 5, 10 boots
At this point I have some doubts and questions: - is the u-boot.sb suitable to be run from MfgTools? - should I expect any char on the serial debug port? - do I have to use the 'elftosb' tool to convert my binary? (README says not)
TIA -- Marco