Hello experts,
I was following u-boot-spl program on our board hoping somewhere serial port will be initialized and also the console using the serial port.
In our FPGA board, there is a small 8 BM on-chip memory in place of DDR and I can use two 51kB sram on-chip.
The spl program is loaded on the first sram and bss and gd was allocated on sdram (actually it's on-chip sram as I said).
I followed u-boot-spl program using some debug prints on memory until it goes into board_init_r function (in common/spl/spl.c).
Just inside the function I see this line
void board_init_r(gd_t *dummy1, ulong dummy2)
{
u32 spl_boot_list[] = {
BOOT_DEVICE_NONE,
BOOT_DEVICE_NONE,
BOOT_DEVICE_NONE,
BOOT_DEVICE_NONE,
BOOT_DEVICE_NONE,
};
struct spl_image_info spl_image;
int ret;
debug(">>" SPL_TPL_PROMPT "board_init_r()\n");
spl_set_bd();
The "debug" macro is the one defined in include/log.h and because I added "#define DEBUG" to the make argument, it uses this definition.
#else /* _DEBUG */
/*
* Output a debug text when condition "cond" is met. The "cond" should be
* computed by a preprocessor in the best case, allowing for the best
* optimization.
*/
#define debug_cond(cond, fmt, args...) \
({ \
if (cond) \
printf(pr_fmt(fmt), ##args); \
})
#endif /* _DEBUG */
So, am I supposed to see the message in my console? From the reset to this point, I couldn't see any serial port initialization (this is arm64 and board_init_f just returned doing nothing. No need to initialize sdram.).
How should I connect uart to console? Should I add my own board_init_f function and do serial_init and console_init_f there?
Any comment or help will be really appreciated.
Thank you!
Chan Kim