RE: When is the console connected during spl run?

["Chan Kim" <ckim@etri.re.kr>]

Hello? 
Anybody that can give me some advice on this please ~
Thank you.
Chan Kim

> -----Original Message-----
> From: U-Boot <u-boot-bounces@lists.denx.de> On Behalf Of Chan Kim
> Sent: Wednesday, December 8, 2021 6:39 PM
> To: U-Boot Mailing List <u-boot@lists.denx.de>
> Subject: When is the console connected during spl run?
> 
> 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
> 
> 
>