AM625: "reset" / "reboot" not working (SD boot/emmc boot) in custom board based on AM625

Hi Jeslin,

Please apply the following U-Boot patch, then try if 'reset' command in U-Boot can reboot your board.

diff --git a/arch/arm/dts/k3-am62-main.dtsi b/arch/arm/dts/k3-am62-main.dtsi
index bdfda77586ed..6a52d097d55e 100644
--- a/arch/arm/dts/k3-am62-main.dtsi
+++ b/arch/arm/dts/k3-am62-main.dtsi
@@ -536,6 +536,7 @@
                ti,itap-del-sel-sdr25 = <0x1>;
                ti,clkbuf-sel = <0x7>;
                bus-width = <4>;
+               no-1-8-v;
                status = "disabled";
        };

Hi Bin,

we made this change.  but it doesnot help.

Hit any key to stop autoboot: 0
=> reset
resetting ...

U-Boot SPL 2021.01-00001-g45cb7e44ae-dirty (Nov 17 2023 - 12:27:43 +0530)
SYSFW ABI: 3.1 (firmware rev 0x0008 '8.6.4--v08.06.04 (Chill Capybar')
SPL initial stack usage: 13424 bytes.

Thanks and Regards,

Swapna.

Hi Swapna,

I will think of any other ways to debug it, and get back to you next week.

Hi Swapna,

Please try the following command at U-Boot prompt to see if it triggers reboot.

=> mw.l 0x43018170 6 1

Hi Bin,

Tried, but did not work:

Hit any key to stop autoboot: 0
=>
=> mw.l 0x43018170 6 1
U-Boot SPL 2021.01-00001-g45cb7e44ae-dirty (Oct 19 2023 - 15:04:50 +0530)
SYSFW ABI: 3.1 (firmware rev 0x0008 '8.6.4--v08.06.04 (Chill Capybar')
SPL initial stack usage: 13424 bytes

Regards,

Swapna,

Hi Bin,

In addition to this, I tried to trace the "SPL initial stack usage" print and added few more print in SPL to see where it get stuck or hang.

In my observation it goes into "board_init_r" function and stuck somewhere there.

I added more prints in board init and in regular boot (power off and power on) I could see all ptints but when "reset" or "reboot" only I could see print after "spl_set_bd();" 

I pasted the code with print for reference, I could see  only ">>1" in reset/reboot. I couldnt see "1.1" and further pint. I might get hanged somewhere in board_init_r function. 

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;

printf(">>" SPL_TPL_PROMPT "board_init_r()\n");

spl_set_bd();
printf(">>1\n");
#if defined(CONFIG_SYS_SPL_MALLOC_START)
mem_malloc_init(CONFIG_SYS_SPL_MALLOC_START,
CONFIG_SYS_SPL_MALLOC_SIZE);
printf("1.1\n");

gd->flags |= GD_FLG_FULL_MALLOC_INIT;
printf("1.2\n");

#endif
if (!(gd->flags & GD_FLG_SPL_INIT)) {
printf("1.3\n");

if (spl_init())
{
printf("1.4\n");
hang();
}
}

Note: If I tried to enable all the Debug prints in SPL, code size getting larger and SPL wont build at all.

Regards,

Jeslin Paul