On 11/26/25 16:00, Quentin Schulz wrote:
Hi Heinrich,
On 11/25/25 7:02 PM, Heinrich Schuchardt wrote:
Hello Jagan, hello Heiko,
When testing U-Boot origin/master on my Raxda Rock Pi 4A serial
console output stops after "PMIC: RK808". The same can be observed
with v2025.01.
The serial console works as expected if I disable
CONFIG_ROCKCHIP_IODOMAIN.
It is I believe implied here but asking for confirmation. The board
doesn't actually boot right? It's not that the serial console is gone,
it's that the device is stuck?
Hello Quentin,
Thank you for looking into this.
The device boots I. But the serial console output becomes mute and I
cannot send keystrokes via the serial console.
The problem seems to be specifically related to the bt656-supply.
Removing the line below also fixes serial console output:
diff --git a/drivers/misc/rockchip-io-domain.c b/drivers/misc/
rockchip- io-domain.c
index a0573c52193..b0d78f2d4b4 100644
--- a/drivers/misc/rockchip-io-domain.c
+++ b/drivers/misc/rockchip-io-domain.c
@@ -239,7 +239,7 @@ static const struct rockchip_iodomain_soc_data
soc_data_rk3328 = {
static const struct rockchip_iodomain_soc_data soc_data_rk3399 = {
.grf_offset = 0xe640,
.supply_names = {
- "bt656-supply", /* APIO2_VDD */
The UART2 (which I assume is the serial you're using for the console)
isn't on that IO domain. And there doesn't seem to be anything important
to booting on APIO2 domain according to Rock 4A schematics[1].
bt656-supply also doesn't seem to be anything special. LDO5 (vcc_3v0) on
RK808, which is using VCC10 (vcc10-supply) which is a fixed regulator
whose parent supply is also a fixed regulator. So I am not sure what
could be going wrong there.
In the schema LD05 on the RK808 is connected to VCC_1V5.
With any of the following values I can enter commands via serial console
but still get no output. So none of the voltages seems to be the correct
one.
diff --git a/dts/upstream/src/arm64/rockchip/rk3399-rock-pi-4.dtsi
b/dts/upstream/src/arm64/rockchip/rk3399-rock-pi-4.dtsi
index 046dbe32901..f15b5b63815 100644
--- a/dts/upstream/src/arm64/rockchip/rk3399-rock-pi-4.dtsi
+++ b/dts/upstream/src/arm64/rockchip/rk3399-rock-pi-4.dtsi
@@ -517,7 +517,7 @@
&io_domains {
audio-supply = <&vcca1v8_codec>;
- bt656-supply = <&vcc_3v0>;
+ bt656-supply = <&vcc_1v5>;
or
+ bt656-supply = <&vcc_0v9>;
or
+ bt656-supply = <&vcc_1v8>;
RK3399 Puma and RockPro64 have APIO2 set to 1.8V vs 3.0V for Radxa Rock
4A. Puma boots master reaches U-Boot CLI with the IO domain driver
compiled in.
Can you check the error paths (all the ones with a continue;) in
rockchip_iodomain_probe()? Which ones do you enter for which supply?
Not sure where to start debugging tbh.
I found the driver by setting CONFIG_LOG=y and log level 7.
Here is how the console output ends. Do you have access to a board or do
you need further debug output?
ofnode_find_subnode: regulator-state-mem: regulator-state-mem:
regulator-state-mem
regulator-state-mem
ofnode_read_bool: regulator-off-in-suspend: true
ofnode_read_u32_index: regulator-suspend-microvolt: of_read_u32_index:
regulator-suspend-microvolt: (not found)
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_u32_index: regulator-min-microvolt: of_read_u32_index:
regulator-min-microvolt: (not found)
ofnode_read_u32_index: regulator-max-microvolt: of_read_u32_index:
regulator-max-microvolt: (not found)
ofnode_read_u32_index: regulator-init-microvolt: of_read_u32_index:
regulator-init-microvolt: (not found)
ofnode_read_u32_index: regulator-min-microamp: of_read_u32_index:
regulator-min-microamp: (not found)
ofnode_read_u32_index: regulator-max-microamp: of_read_u32_index:
regulator-max-microamp: (not found)
ofnode_read_u32_index: regulator-ramp-delay: of_read_u32_index:
regulator-ramp-delay: (not found)
ofnode_read_bool: regulator-force-boot-off: false
ofnode_find_subnode: regulator-state-mem: regulator-state-mem:
regulator-state-mem
regulator-state-mem
ofnode_read_bool: regulator-off-in-suspend: true
ofnode_read_u32_index: regulator-suspend-microvolt: of_read_u32_index:
regulator-suspend-microvolt: (not found)
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_u32_index: regulator-min-microvolt: of_read_u32_index:
regulator-min-microvolt: (not found)
ofnode_read_u32_index: regulator-max-microvolt: of_read_u32_index:
regulator-max-microvolt: (not found)
ofnode_read_u32_index: regulator-init-microvolt: of_read_u32_index:
regulator-init-microvolt: (not found)
ofnode_read_u32_index: regulator-min-microamp: of_read_u32_index:
regulator-min-microamp: (not found)
ofnode_read_u32_index: regulator-max-microamp: of_read_u32_index:
regulator-max-microamp: (not found)
ofnode_read_u32_index: regulator-ramp-delay: of_read_u32_index:
regulator-ramp-delay: (not found)
ofnode_read_bool: regulator-force-boot-off: false
ofnode_find_subnode: regulator-state-mem: regulator-state-mem:
regulator-state-mem
regulator-state-mem
ofnode_read_bool: regulator-off-in-suspend: true
ofnode_read_u32_index: regulator-suspend-microvolt: of_read_u32_index:
regulator-suspend-microvolt: (not found)
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_prop: assigned-clock-rates: <not found>
ofnode_read_u32_index: bt656-supply: of_read_u32_index: bt656-supply:
0x7a (122)
rockchip_iodomain io-domains: bt656-supply: Regulator LDO_REG8 at 3000000 uV
ofnode_read_u32_index: audio-supply: of_read_u32_index: audio-supply:
0x91 (145)
rockchip_iodomain io-domains: audio-supply: Regulator LDO_REG1 at 1800000 uV
ofnode_read_u32_index: sdmmc-supply: of_read_u32_@L@@p0b@HHb```Hp0 p0 $
Best regards
Heinrich
[1] https://dl.radxa.com/rockpi4/docs/hw/rockpi4/4a/ROCK_4A_V1.52_SCH.pdf
Cheers,
Quentin
