How the Jetson TX2 NX controls gpio in Uboot command line mode

[17679339172]

Hi,
The BSP version I’m using is 32.7.2 and I’ve used the gpio command to control the GPIO3_PW.03 output high, but it always stays low.

And I pulled this pin high externally, read its status and still show low, how should I solve this problem?

[JerryChang]

hello 17679339172,

could you please also confirm the GPIO configuration in UBoot environment.
for example,

Usage: 
gpio <input|set|clear|toggle> <pin> 
 - input/set/clear/toggle the specified pin 
gpio status [-a] [<bank> | <pin>] - show [all/claimed] GPIOs

[17679339172]

Hi,
Isn’t this command only able to control GPIO high and low levels and read GPIO status, how should I get its configuration?
I used ‘gpio status -a’ in the Uboot environment and the output is as follows.

Tegra186 (P3636-0001) # gpio status -a
Bank A:
A0: output: 0
A1: input: 0
A2: input: 0
A3: input: 0
A4: input: 0
A5: output: 0
A6: input: 0
A7: input: 0
Bank B:
B0: input: 0
B1: input: 0
B2: input: 0
B3: input: 0
B4: input: 0
B5: input: 0
B6: input: 0
B7: input: 0
Bank C:
C0: input: 0
C1: input: 0
C2: input: 1
C3: input: 1
C4: input: 0
C5: input: 0
C6: input: 0
C7: input: 0
Bank D:
D0: input: 0
D1: input: 0
D2: input: 0
D3: input: 0
D4: input: 0
D5: input: 0
D6: input: 0
D7: input: 0
Bank E:
E0: input: 0
E1: input: 0
E2: input: 0
E3: input: 0
E4: input: 0
E5: input: 0
E6: input: 0
E7: input: 0
Bank F:
F0: input: 0
F1: input: 0
F2: input: 0
F3: input: 0
F4: input: 0
F5: input: 0
F6: input: 0
F7: input: 0
Bank G:
G0: input: 0
G1: input: 0
G2: input: 0
G3: input: 0
G4: input: 0
G5: input: 0
G6: input: 0
G7: input: 0
Bank H:
H0: input: 0
H1: input: 0
H2: input: 0
H3: input: 0
H4: output: 0
H5: input: 0
H6: output: 1
H7: input: 0
Bank I:
I0: input: 0
I1: input: 0
I2: input: 0
I3: input: 0
I4: input: 0
I5: input: 0
I6: input: 0
I7: input: 0
Bank J:
J0: input: 0
J1: input: 0
J2: input: 0
J3: input: 0
J4: input: 0
J5: input: 0
J6: input: 0
J7: input: 0
Bank K:
K0: input: 0
K1: input: 0
K2: input: 0
K3: input: 0
K4: input: 0
K5: input: 0
K6: input: 0
K7: input: 0
Bank L:
L0: output: 0
L1: input: 0
L2: output: 0
L3: output: 1
L4: input: 0
L5: input: 0
L6: input: 0
L7: input: 0
Bank M:
M0: input: 0
M1: input: 0
M2: input: 0
M3: input: 0
M4: output: 0 ethernet@2490000.phy-reset-gpios
M5: input: 0
M6: input: 0
M7: input: 0
Bank N:
N0: output: 0
N1: input: 1
N2: input: 0
N3: output: 0
N4: input: 0
N5: input: 0
N6: input: 0
N7: input: 0
Bank O:
O0: input: 0
O1: input: 0
O2: input: 0
O3: input: 0
O4: input: 0
O5: input: 0
O6: input: 0
O7: input: 0
Bank P:
P0: input: 0
P1: input: 0
P2: input: 0
P3: input: 0
P4: input: 0 sdhci@3400000.wp-gpios
P5: input: 0 sdhci@3400000.cd-gpios
P6: output: 1 sdhci@3400000.power-gpios
P7: input: 0
Bank Q:
Q0: input: 0
Q1: input: 0
Q2: input: 0
Q3: input: 0
Q4: input: 0
Q5: input: 0
Q6: input: 0
Q7: input: 0
Bank R:
R0: input: 0
R1: input: 0
R2: input: 0
R3: input: 0
R4: input: 0
R5: input: 0
R6: input: 0
R7: input: 0
Bank T:
T0: input: 0
T1: input: 0
T2: input: 0
T3: input: 0
T4: input: 0
T5: input: 0
T6: input: 0
T7: input: 0
Bank X:
X0: input: 0
X1: input: 0
X2: input: 0
X3: input: 0
X4: output: 0
X5: input: 0
X6: input: 0
X7: input: 0
Bank Y:
Y0: input: 0
Y1: input: 0
Y2: input: 0
Y3: input: 1
Y4: input: 0
Y5: input: 0
Y6: input: 0
Y7: input: 0
Bank BB:
BB0: input: 0
BB1: input: 0
BB2: input: 0
BB3: input: 0
BB4: input: 0
BB5: input: 0
BB6: input: 0
BB7: input: 0
Bank CC:
CC0: input: 0
CC1: input: 0
CC2: input: 0
CC3: input: 0
CC4: input: 0
CC5: input: 0
CC6: input: 0
CC7: input: 0
Bank S:
S0: input: 0
S1: input: 0
S2: input: 0
S3: input: 0
S4: input: 0
S5: input: 0
S6: input: 0
S7: input: 0
Bank U:
U0: output: 0
U1: input: 0
U2: input: 0
U3: input: 0
U4: input: 0
U5: output: 0
U6: input: 0
U7: input: 0
Bank V:
V0: input: 0
V1: input: 0
V2: input: 0
V3: input: 0
V4: input: 0
V5: input: 0
V6: output: 0
V7: input: 0
Bank W:
W0: input: 0
W1: input: 0
W2: input: 0
W3: input: 0
W4: input: 0
W5: input: 0
W6: input: 0
W7: input: 0
Bank Z:
Z0: input: 0
Z1: input: 0
Z2: input: 0
Z3: input: 0
Z4: input: 0
Z5: input: 0
Z6: input: 0
Z7: input: 0
Bank AA:
AA0: input: 0
AA1: input: 0
AA2: input: 0
AA3: input: 0
AA4: input: 0
AA5: input: 0
AA6: input: 0
AA7: input: 0
Bank EE:
EE0: input: 0
EE1: input: 0
EE2: input: 1
EE3: input: 0
EE4: input: 0
EE5: input: 0
EE6: input: 0
EE7: input: 0
Bank FF:
FF0: input: 1
FF1: input: 1
FF2: input: 0
FF3: input: 0
FF4: input: 0
FF5: input: 0
FF6: input: 0
FF7: input: 0

[JerryChang]

hello 17679339172,

it shows this pin as input direction.

@17679339172

Bank W:
W3: input: 0

please refer to pinmux spreadsheets, this pin is default configured as UC3_RXD for UART communication.
you should also modify pinmux configuration to use this pin.