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Original question:

PROCESSOR-SDK-AM62X: How to modify GPIO pins

PROCESSOR-SDK-AM62X: How to Modify GPIO and Boot it from eMMC

Suan Theng
Prodigy 30 points

Part Number: PROCESSOR-SDK-AM62X

Hi,

For the previous forum, I had asked about how to modify GPIO and boot it from SD card, and I already solved my problem.

Now, I had continue to work on how to modify GPIO and boot it from eMMC, is there any possible way or reference to do so?  From my information, we need to build the required files, tiboot3.bin, tispl.bin, u-boot.img and am62x-tisdk-base.ext4. 

So, my question is, is this directory: /home/$USER/ti-processor-sdk-linux-am62xx-evm-08.04.01.03/board-support/u-boot-2021.01+gitAUTOINC+2dd2e1d366-g2dd2e1d366/arch/arm/dts where the k3-am62x-sk-common.dtsi needs to be modify?

If is, how do we build the dtb files, as 'make dtbs' does not work for u-boot.

After building the dtb files, where should we replace it to?

  • 0
    TI__Guru* 79380 points

    Hello,
    It looks like you posted two separate inquiry:
    1/. GPIO in u-boot: depending on your user case, it is possible to add your code to control GPIO in u-boot after configuring gpio pinmux...But out-of-box (i.e. as currently supported in Linux kernel) gpio driver @u-boot is not fully enabled/tested on AM62x...
    2/. eMMC flashing
    - Linux SDK
    software-dl.ti.com/.../UG-Memory.html
    - eMMC flashing with USB-DFU
    e2e.ti.com/.../faq-sk-am62-how-to-flash-emmc-using-usb-dfu-on-am62x-sk-e2
    Best,
    -Hong

  • 0 in reply to Hong Guan64
    Prodigy 30 points

    Does it mean that from now there still no examples on controlling GPIO in u-boot? 

    Is there any way to build and flash the modified files into the AM62x board directly instead of making AM62x board as a storage device and copy the dtb files manually inside the boot folder of the AM62x board?

  • 0 in reply to Suan Theng
    TI__Guru* 79380 points

    Hello,
    I'm attaching a log file on "gpio" cmd @u-boot I captured on AM62x-SK
    - The u-boot is based off SDK 8.6 release (www.ti.com/.../08.06.00.42)
    - a simple u-boot patch to enable "gpio" cmd
    Hopefully it is helpful for your user case.
    Best,
    -Hong

    https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/791/0247.am62x_5F00_gpio.patch

    Fullscreen 7776.am62x_8.6_gpio.log Download 
    U-Boot SPL 2021.01-00001-g45cb7e4-dirty (Mar 14 2023 - 22:58:17 -0500)
SYSFW ABI: 3.1 (firmware rev 0x0008 '8.6.4--v08.06.04 (Chill Capybar')
SPL initial stack usage: 13424 bytes
Trying to boot from MMC2
Warning: Detected image signing certificate on GP device. Skipping certificate to prevent boot failure. This will fail if the image was also encrypted
Warning: Detected image signing certificate on GP device. Skipping certificate to prevent boot failure. This will fail if the image was also encrypted
Warning: Detected image signing certificate on GP device. Skipping certificate to prevent boot failure. This will fail if the image was also encrypted
Warning: Detected image signing certificate on GP device. Skipping certificate to prevent boot failure. This will fail if the image was also encrypted
Warning: Detected image signing certificate on GP device. Skipping certificate to prevent boot failure. This will fail if the image was also encrypted
Loading Environment from MMC... *** Warning - No MMC card found, using default environment

Starting ATF on ARM64 core...

NOTICE:  BL31: v2.8(release):v2.8-226-g2fcd408bb3-dirty
NOTICE:  BL31: Built : 05:06:58, Feb 24 2023

U-Boot SPL 2021.01-00001-g45cb7e4-dirty (Mar 14 2023 - 22:57:08 -0500)
SYSFW ABI: 3.1 (firmware rev 0x0008 '8.6.4--v08.06.04 (Chill Capybar')
Trying to boot from MMC2


U-Boot 2021.01-00001-g45cb7e4-dirty (Mar 14 2023 - 22:57:08 -0500)

SoC:   AM62X SR1.0 GP
Model: Texas Instruments AM625 SK
EEPROM not available at 0x50, trying to read at 0x51
Board: AM62-SKEVM rev E2
DRAM:  2 GiB
MMC:   mmc@fa10000: 0, mmc@fa00000: 1, mmc@fa20000: 2
Loading Environment from MMC... OK
In:    serial@2800000
Out:   serial@2800000
Err:   serial@2800000
Net:   eth0: ethernet@8000000port@1
Hit any key to stop autoboot:  2  0
=> dm tree
 Class     Index  Probed  Driver                Name
-----------------------------------------------------------
 root          0  [ + ]   root_driver           root_driver
 simple_bus    0  [ + ]   simple_bus            |-- bus@f0000
 simple_bus    1  [ + ]   simple_bus            |   |-- bus@4000000
 pinctrl       0  [ + ]   single-pinctrl        |   |   |-- pinctrl@4084000
 remoteproc    0  [   ]   k3_m4                 |   |   `-- m4fss@5000000
 simple_bus    2  [ + ]   simple_bus            |   |-- bus@2b000000
 syscon        0  [ + ]   syscon                |   |   `-- syscon@43000000
 soc           0  [ + ]   soc_ti_k3             |   |       `-- chipid@14
 syscon        1  [   ]   syscon                |   |-- syscon@100000
 simple_bus    3  [ + ]   simple_bus            |   |-- bus@48000000
 mailbox       0  [ + ]   k3-secure-proxy       |   |   |-- mailbox@4d000000
 dma           0  [   ]   ti-udma               |   |   |-- dma-controller@485c0100
 dma           1  [   ]   ti-udma               |   |   `-- dma-controller@485c0000
 firmware      0  [ + ]   ti_sci                |   |-- system-controller@44043000
 power_doma    0  [ + ]   ti-sci-pm-domains     |   |   |-- power-controller
 clk           0  [ + ]   ti-sci-clk            |   |   |-- clock-controller
 reset         0  [   ]   ti-sci-reset          |   |   |-- reset-controller
 sysreset      0  [   ]   ti-sci-sysreset       |   |   `-- sysreset-controller
 pinctrl       1  [ + ]   single-pinctrl        |   |-- pinctrl@f4000
 pinconfig     0  [ + ]   pinconfig             |   |   |-- main-uart0-pins-default
 pinconfig     1  [   ]   pinconfig             |   |   |-- main-i2c0-pins-default
 pinconfig     2  [   ]   pinconfig             |   |   |-- main-i2c1-pins-default
 pinconfig     3  [   ]   pinconfig             |   |   |-- main-i2c2-pins-default
 pinconfig     4  [ + ]   pinconfig             |   |   |-- main-mmc0-pins-default
 pinconfig     5  [ + ]   pinconfig             |   |   |-- main-mmc1-pins-default
 pinconfig     6  [   ]   pinconfig             |   |   |-- usr-led-pins-default
 pinconfig     7  [ + ]   pinconfig             |   |   |-- main-mdio1-pins-default
 pinconfig     8  [ + ]   pinconfig             |   |   |-- main-rgmii1-pins-default
 pinconfig     9  [ + ]   pinconfig             |   |   |-- main-rgmii2-pins-default
 pinconfig    10  [   ]   pinconfig             |   |   |-- vdd-sd-dv-pins-default
 pinconfig    11  [   ]   pinconfig             |   |   |-- extcon-usb0-gpio-id-pins-default
 pinconfig    12  [   ]   pinconfig             |   |   |-- main-usb1-pins-default
 pinconfig    13  [   ]   pinconfig             |   |   `-- ospi0-pins-default
 serial        0  [ + ]   omap_serial           |   |-- serial@2800000
 i2c           0  [   ]   i2c_omap              |   |-- i2c@20000000
 i2c           1  [   ]   i2c_omap              |   |-- i2c@20010000
 gpio          0  [   ]   pca953x               |   |   `-- gpio@22
 gpio          1  [   ]   ti_dm6441_gpio        |   |-- gpio@600000
 gpio          2  [   ]   ti_dm6441_gpio        |   |-- gpio@601000
 mmc           0  [ + ]   am654_sdhci           |   |-- mmc@fa10000
 blk           0  [ + ]   mmc_blk               |   |   `-- mmc@fa10000.blk
 mmc           1  [ + ]   am654_sdhci           |   |-- mmc@fa00000
 blk           1  [   ]   mmc_blk               |   |   `-- mmc@fa00000.blk
 mmc           2  [ + ]   am654_sdhci           |   |-- mmc@fa20000
 blk           2  [   ]   mmc_blk               |   |   `-- mmc@fa20000.blk
 nop           0  [   ]   dwc3-ti               |   |-- dwc3-usb@f900000
 usb           0  [   ]   dwc3-generic-periphe  |   |   `-- usb@31000000
 nop           1  [   ]   dwc3-ti               |   |-- dwc3-usb@f910000
 usb           0  [   ]   dwc3-generic-host     |   |   `-- usb@31100000
 simple_bus    4  [   ]   simple_bus            |   |-- bus@fc00000
 spi           0  [   ]   cadence_spi           |   |   `-- spi@fc40000
 spi_flash     0  [   ]   jedec_spi_nor         |   |       `-- flash@0
 misc          0  [ + ]   am65_cpsw_nuss        |   `-- ethernet@8000000
 eth           0  [ + ]   am65_cpsw_nuss_port   |       `-- ethernet@8000000port@1
 regulator     0  [   ]   regulator_fixed       |-- regulator-0
 regulator     1  [   ]   regulator_fixed       |-- regulator-1
 regulator     2  [   ]   regulator_fixed       |-- regulator-2
 regulator     3  [   ]   regulator_fixed       |-- fixed-regulator-sd
 regulator     4  [   ]   gpio regulator        |-- gpio-regulator-TLV71033
 firmware      1  [   ]   psci                  `-- psci
=> gpio
gpio - query and control gpio pins

Usage:
gpio <input|set|clear|toggle> <pin>
    - input/set/clear/toggle the specified pin
gpio status [-a] [<bank> | <pin>]  - show [all/claimed] GPIOs
=> gpio status -a
Bank gpio@22_:
gpio@22_0: input: 1 [ ]
gpio@22_1: input: 1 [ ]
gpio@22_2: input: 1 [ ]
gpio@22_3: output: 1 [ ]
gpio@22_4: input: 0 [ ]
gpio@22_5: input: 0 [ ]
gpio@22_6: input: 0 [ ]
gpio@22_7: input: 1 [ ]
gpio@22_8: input: 1 [ ]
gpio@22_9: input: 1 [ ]
gpio@22_10: input: 1 [ ]
gpio@22_11: input: 0 [ ]
gpio@22_12: input: 1 [ ]
gpio@22_13: input: 0 [ ]
gpio@22_14: input: 0 [ ]
gpio@22_15: input: 0 [ ]
gpio@22_16: input: 1 [ ]
gpio@22_17: input: 1 [ ]
gpio@22_18: input: 0 [ ]
gpio@22_19: input: 0 [ ]
gpio@22_20: input: 1 [ ]
gpio@22_21: input: 1 [ ]
gpio@22_22: input: 1 [ ]
gpio@22_23: input: 0 [ ]
0: input: 0 [ ]
1: input: 0 [ ]
2: input: 0 [ ]
3: input: 0 [ ]
4: input: 0 [ ]
5: input: 0 [ ]
6: input: 0 [ ]
7: input: 0 [ ]
8: input: 0 [ ]
9: input: 0 [ ]
10: input: 0 [ ]
11: input: 0 [ ]
12: input: 0 [ ]
13: input: 0 [ ]
14: input: 0 [ ]
15: input: 1 [ ]
16: input: 1 [ ]
17: input: 1 [ ]
18: input: 1 [ ]
19: input: 1 [ ]
20: input: 1 [ ]
21: input: 1 [ ]
22: input: 1 [ ]
23: input: 0 [ ]
24: input: 0 [ ]
25: input: 0 [ ]
26: input: 0 [ ]
27: input: 0 [ ]
28: input: 0 [ ]
29: input: 0 [ ]
30: input: 0 [ ]
31: output: 0 [ ]
32: input: 0 [ ]
33: input: 0 [ ]
34: input: 0 [ ]
35: input: 0 [ ]
36: input: 0 [ ]
37: input: 0 [ ]
38: input: 0 [ ]
39: input: 0 [ ]
40: input: 0 [ ]
41: input: 0 [ ]
42: input: 0 [ ]
43: input: 0 [ ]
44: input: 0 [ ]
45: input: 0 [ ]
46: input: 0 [ ]
47: input: 0 [ ]
48: input: 0 [ ]
49: input: 0 [ ]
50: input: 0 [ ]
51: input: 0 [ ]
52: input: 0 [ ]
53: input: 0 [ ]
54: input: 0 [ ]
55: input: 0 [ ]
56: input: 0 [ ]
57: input: 0 [ ]
58: input: 0 [ ]
59: input: 0 [ ]
60: input: 0 [ ]
61: input: 0 [ ]
62: input: 0 [ ]
63: input: 0 [ ]
64: input: 0 [ ]
65: input: 0 [ ]
66: input: 0 [ ]
67: input: 0 [ ]
68: input: 0 [ ]
69: input: 0 [ ]
70: input: 0 [ ]
71: input: 0 [ ]
72: input: 0 [ ]
73: input: 0 [ ]
74: input: 0 [ ]
75: input: 0 [ ]
76: input: 0 [ ]
77: input: 0 [ ]
78: input: 0 [ ]
79: input: 0 [ ]
80: input: 0 [ ]
81: input: 0 [ ]
82: input: 0 [ ]
83: input: 0 [ ]
84: input: 0 [ ]
85: input: 1 [ ]
86: input: 0 [ ]
0: input: 0 [ ]
1: input: 0 [ ]
2: input: 1 [ ]
3: input: 0 [ ]
4: input: 0 [ ]
5: input: 0 [ ]
6: input: 0 [ ]
7: input: 1 [ ]
8: input: 0 [ ]
9: input: 0 [ ]
10: input: 0 [ ]
11: input: 0 [ ]
12: input: 0 [ ]
13: input: 1 [ ]
14: input: 0 [ ]
15: input: 0 [ ]
16: input: 0 [ ]
17: input: 0 [ ]
18: input: 0 [ ]
19: input: 0 [ ]
20: input: 1 [ ]
21: input: 0 [ ]
22: input: 0 [ ]
23: input: 0 [ ]
24: input: 0 [ ]
25: input: 0 [ ]
26: input: 1 [ ]
27: input: 1 [ ]
28: input: 1 [ ]
29: input: 1 [ ]
30: input: 0 [ ]
31: input: 0 [ ]
32: input: 1 [ ]
33: input: 1 [ ]
34: input: 1 [ ]
35: input: 1 [ ]
36: input: 1 [ ]
37: input: 1 [ ]
38: input: 1 [ ]
39: input: 1 [ ]
40: input: 0 [ ]
41: input: 1 [ ]
42: input: 1 [ ]
43: input: 1 [ ]
44: input: 1 [ ]
45: input: 1 [ ]
46: input: 0 [ ]
47: input: 1 [ ]
48: input: 0 [ ]
49: input: 0 [ ]
50: input: 0 [ ]
51: input: 0 [ ]
52: input: 0 [ ]
53: input: 0 [ ]
54: input: 0 [ ]
55: input: 0 [ ]
56: input: 0 [ ]
57: input: 0 [ ]
58: input: 0 [ ]
59: input: 0 [ ]
60: input: 0 [ ]
61: input: 0 [ ]
62: input: 0 [ ]
63: input: 0 [ ]
64: input: 0 [ ]
65: input: 0 [ ]
66: input: 0 [ ]
67: input: 0 [ ]
68: input: 0 [ ]
69: input: 0 [ ]
70: input: 0 [ ]
71: input: 0 [ ]
72: input: 0 [ ]
73: input: 0 [ ]
74: input: 0 [ ]
75: input: 0 [ ]
76: input: 0 [ ]
77: input: 0 [ ]
78: input: 0 [ ]
79: input: 0 [ ]
80: input: 0 [ ]
81: input: 0 [ ]
82: input: 0 [ ]
83: input: 0 [ ]
84: input: 0 [ ]
85: input: 0 [ ]
86: input: 0 [ ]
87: input: 0 [ ]
=>