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Part Number: AM6442
Other Parts Discussed in Thread: SYSCONFIG
Hello TI team,
I follow the https://dev.ti.com/tirex/content/mcu_plus_sdk_am64x_09_00_00_30/docs/api_guide_am64x/EXAMPLES_DRIVERS_GPIO_INPUT_INTERRUPT.html,modify dts,and update dtb in sd card, but still error.
Thanks
Allen
Hello Allen,
Thanks for reaching out to Texas Instruments E2E support forum.
Can you please share the below details?
Regards,
Tushar
Hi Tushar,
I test the ospi boot mode,
modify the Resource Management Configuration Data,and rebuild,
then rebuild SBL example, flash SOC,
if use main domain GPIO, interrupt example can runing,
but use mcu domain GPIO, still error.
Thanks
Allen
Hello Allen,
Thanks for your patience.
The MCU+SDK example are not made to support the cross functionality. Please refer release notes.
You need to do the GPIO configuration changes in the example to make it work for MCU M4F.
Please follow the below steps.
gmake -s -C tools/sysfw/boardcfg
gmake -s -C examples/drivers/boot/sbl_null/am64x-evm/r5fss0-0_nortos/ti-arm-clang clean gmake -s -C examples/drivers/boot/sbl_null/am64x-evm/r5fss0-0_nortos/ti-arm-clang
After doing the above changes the GPIO Input interrupt example should work as expected. Please let me know if the above solution works.
Regards,
Tushar
Hello Allen,
Thanks for your response. Please find the below explanation.
The GPIO_INPUT_INTERRUPT example running on R5FSS0_0 is based on MCU+ SDK while Linux running on A53 is based on Processor SDK. The problem comes because of the RM configuration differences in these SDKs. We have to initialize the board with the right RM configurations to make this example work.
There are three ways to initialize the board:
| S. No. | Boot Flow | Use Case |
| 1 | SBL from MCU+ SDK | NORTOS/FreeRTOS example running on A53SS, R5FSS, M4FSS |
| 2 | SPL from Processor SDK | Linux running on A53SS |
| 3 | Linux SBL from MCU+ SDK | NORTOS/FreeRTOS example running on R5FSS, M4FSS & Linux running on A53SS |
The default GPIO_INPUT_INTERRUPT example is coded to work out-of-the box with the SBL from MCU+ SDK. If we used SPL to initialize the board, then the example does not work because Processor SDK uses different RM configurations. For the third option, the RM configurations used are the same as used in Processor SDK so the example does not work in this case also.
In a nutshell, the GPIO_INPUT_INTERRUPT example works only with the first option while we need to tweak the RM configurations in case of second and third option to make the example work.
To run the default GPIO example with Linux SPL, you need to modify the resource allocation for MAIN_GPIOMUX_INTROUTER & MCU_GPIOMUX_INTROUTER to route interrupts to R5F core instead of A53.
For more details on GPIO interrupt router, please refer GPIO Interrupt Router.
Please change the rm-cfg.yaml file located at path ${Processor SDK}/board-support/ti-u-boot/board/ti/am64x/ as given below.
# SPDX-License-Identifier: GPL-2.0+
# Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com/
#
# Resource management configuration for AM64x
#
---
rm-cfg:
rm_boardcfg:
rev:
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boardcfg_abi_min : 0x1
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num_resource: 2
type: 2124
host_id: 35
reserved: 0
-
start_resource: 20
num_resource: 2
type: 2124
host_id: 36
reserved: 0
-
start_resource: 22
num_resource: 2
type: 2124
host_id: 38
reserved: 0
-
start_resource: 24
num_resource: 2
type: 2124
host_id: 41
reserved: 0
-
start_resource: 26
num_resource: 2
type: 2124
host_id: 43
reserved: 0
-
start_resource: 28
num_resource: 4
type: 2124
host_id: 128
reserved: 0
The above file allocated the MAIN_GPIOMUX_INTROUTER[0:12] and MCU_GPIOMUX_INTROUTER[0:4] to R5F0-0 core.
Now run the below command to build u-boot.
make u-boot
After building the u-boot, copy the tiboot3.bin file to SD card and initialize the EVM.
The tiboot3.bin file can be found at ${Processor SDK}/board-support/u-boot-build/r5.
After doing the above mentioned changes you should be able to run the example without errors.
For MCU GPIO :
To use the MCU_GPIO, please do the changes in example.syscfg & generated file and exclude it from the build settings as mentioned in above replies. Also do the dts & dtb file changes as mentioned in the MCU+SDK documentation. Please refer GPIO_INPUT_INTERRUPT.
Regards,
Tushar
