TDA4VM: rsc table truncated issue during linux startup

Kai Shen

Part Number: TDA4VM

Hi, expert,

We are testing the CDDIPC function based on SDK(ti-processor-sdk-rtos-j721e-evm-08_00_01_10 and ti-processor-sdk-linux-j7-evm-08_00_01_13).

we try to load the resource table on MCU2_1 and communicate with A72(linux env). The IPC communication will be failed sometimes after board reset. When it's failed, the UART log from linux show that rsc table is truncated.

[ 13.843463] remoteproc remoteproc5: rsc table is truncated

I'd like to know what's the reason linux will report this error?

Thanks

linux log.txt

over 3 years ago

0 Suman Anna over 3 years ago

TI__Guru** 102295 points

Hi Kai,

The 8.x SDK has enhanced the remoteproc driver to avoid reloading of firmwares when the remote processors are early booted. This requires the .resource_table section to be linked at a specific address (base of the reserved-memory firmware region, the 2nd entry assigned to memory-regions in dts). This wasn't a constraint in previous 7.x SDKs, since firmware was read again in kernel to retrieve the .resource_table.

So, for MCU2_1, with non-Vision Apps memory layout, this should be at 0xa3100000.

Also, note that the CddIPC examples with Linux have been broken in SDK. Please refer to the following FAQ, for reference code.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1125865/faq-processor-sdk-j721e-cdd_ipc_app_rp_linux-does-not-build-on-processor-sdk-rtos-8-2-for-the-core-mcu-2_1

regards

Suman

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TDA4VM: rsc table truncated issue during linux startup