TDA2HG: [Booting optimisation] fast boot for Link&chain in IPUs

user5312037

Part Number: TDA2HG

Hello:

we're working on visonsdk 3.08 with Linux+RTOS

here are the usecase:

UseCase: chains_csi2CalMultiCam_View

Capture -> Dup_Capture
Dup_Capture -> Alg_Camera(A15)
Dup_Capture -> VPE_4In1 -> Alg_Mosaic -> Alg_Camera(A15)

DispDistSrc_weston -> DssM2mWb-> Display_m4

PushFramePsld(A15) -> Dup1 -> Alg_psld_imageprocess (EVE1) -> Alg_psld_parkingdetection (DSP1) ->  AlgoResultPsld(A15)

PushFrameSod(A15) -> Dup2 ->  Alg_sod_feature (EVE2) -> Alg_sod_classifier (DSP2) ->  AlgoResultSod(A15)

for booting optimisation, we apply the early-boot and late attach. but the whole link&chain are started from linux side to initiatite the pluggin on different IPUs(IPU2/EVE/DSP), the apps.out will take more than 4s to complete.

my question:

is there way to let the IPUs initiate own pluggin in early boot phase and late attach?

over 6 years ago

0 Stanley Liu over 6 years ago

TI__Guru 50045 points

Hi,

With early boot and late attach patches, the link & chain on IPU2 will start after the image is loaded in SPL.

IPU2 doesn't wait for Linux to start app.out. This is what the early boot and late attach enable.

When you run app.out later, it will output the logs from IPU2/DSP/EVE but those are the logs generated during boot (check the timestamp of the logs).

Regards,
Stanley

0 user5312037 over 6 years ago in reply to Stanley Liu

Genius 4320 points

Hi Stanley:

when apps.out start, then IPUs will initiate the pluggin, at that time IPUs can know which pluggin which be used.

that mean custom use case is eastablished only when apps.out started, that's too late.

0 Stanley Liu over 6 years ago in reply to user5312037

TI__Guru 50045 points

Sorry, I was not very clear in the previous response.

What early boot & late attach can help is the application running on M4 which has no dependency on A15 side.

In your use case, there are components on A15 side so it can't start until A15 is ready.

Early boot & late attach can not improve the boot time of this use case.

You can refer to the below application note for boot time optimization in general.

https://www.ti.com/lit/an/spracd1/spracd1.pdf

https://www.ti.com/lit/an/sprac30a/sprac30a.pdf

0 user5312037 over 6 years ago in reply to Stanley Liu

Genius 4320 points

Hi Stanley:

Thanks for your sharing.

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TDA2HG: [Booting optimisation] fast boot for Link&chain in IPUs