AM6548: R5F Hello world

Mohsen Khayami

Part Number: AM6548

I was wondering if there is a hello world bare metal code to run on R5F? i like to load this from u-boot using rproc? I assume it has to setup the MPU and enable all the cache. It seems that all the files are part of the pdk but no example as to how to call each function in the startup.c file? Any help here would be great. Also i am hoping it can use gcc to compile and no XDC please.

I know you can use ccs to get a hello world project but it does not show you how to setup the MPU and clear the cache to start with and it is not able to be loaded from u-boot using rproc.

Thanks

over 5 years ago

0 Frank Livingston over 5 years ago

TI__Mastermind 29388 points

Hi Mohsen,

PLSDK docs are here:

You can build an R5F bare metal application as follows:

Run CCS
File -> New -> CCS Project
Target: AM6548, Cortex R [ARM] tab
For project template, select "Hello World"
Select project name, e.g. "test"
Click Finish
Right-click project -> Properties, General.
Set device endianness to little
For linker command file, add "<PDK>\packages\ti\build\am65xx\linker_r5.lds"
Expand ARM Compiler, click Processor Options
For Target processor version, select 7R5, for floating point support select VFPv3D16
Expand ARM Linker, click File Search Path
Add "<PDK>\packages\ti\csl\lib\am65xx\r5f\release" to library search path
Add libraries "ti.csl.aer5f" and "ti.csl.init.aer5f"

The CSL startup code will be linked into the application. MPU & cache setup are included in the CSL startup code. If you want to change the MPU settings, please see details in header file <PDK>\packages\ti\csl\arch\r5\csl_arm_r5_mpu.h, header for structure CSL_ArmR5MpuRegionCfg:

/**
* \brief Structure containing the region configuration parameters.
* If application wants to do it's own MPU region configuration
* (override the default one), then it needs to define this variable
* and initialize that to desired values:
* Var: 'const CSL_ArmR5MpuRegionCfg gCslR5MpuCfg[CSL_ARM_R5F_MPU_REGIONS_MAX]'
* With above application can have it's own MPU configuration, but
* MPU configuration will still happen at boot/startup time.
* Default configurations for MPU regions is present under file:
* "\src\startup\startup.c"
*/

To use this with U-boot rproc:

The R5F code should have a resource table, an example is here:

https://git.ti.com/gitweb?p=ipc/ipcdev.git;a=blob;f=packages/ti/ipc/remoteproc/rsc_table_am65xx_r5f.h;h=8dba08111ed584b6ed2f993b791fa32c3def0198;hb=refs/heads/master

The boot code needs to be linked to ATCM (code contained in <PDK>\packages\ti\csl\arch\r5\src\startup, I think this is located in ti.csl.init.aer5f, use arm-none-eabi-objdump.exe to confirm) the Please use this command file as a guide:

https://git.ti.com/gitweb?p=ipc/ipcdev.git;a=blob;f=packages/ti/ipc/tests/R5FLink.cmd;h=2e616a2d7e2e4a4cd1f5a8c805eb506933be530f;hb=refs/heads/master

I would start by using the TI ARM compiler, and then try the GCC compiler for R5F.

Let me know if this all works out..

Regards,
Frank

Processors

Processors forum

AM6548: R5F Hello world