AM5728: Mailbox communication

Geek13

Part Number: AM5728

Hi All,

Am trying to access mailbox from Linux user space using devmem2 for mailbox1 user 0. Want to send message from A15 side to DSP core using Mailbox

A15 is running with Linux & DSP core running with interrupt based CSL application of Mailbox receiving.

Not getting an mailbox interrupt on DSP side when I write some dummy data using devmem2 from Linix side.

Interrupt configuration at DSP side as follow:

#define MAILBOX_IRQ_NO ( 52U )
#define IRQ_CFG_REQUIRED ( 1U )
#define IRQ_XBAR_CPU_ID CSL_XBAR_IRQ_CPU_ID_DSP1
#define IRQ_XBAR_INST_NO CSL_XBAR_INST_DSP1_IRQ_52
#define IRQ_XBAR_INDEX CSL_XBAR_MAILBOX1_IRQ_USER0

#define MAILBOX_BASE_ADDRESS SOC_MAILBOX1_BASE
#define MAILBOX_USER ( 0U )

Linux side command:

To write

devmem2 0x4A0F4040 w 0x12345678

To read back

devmem2 0x4A0F4040

But didn't get any mailbox interrupt on DSP side. Also not able to debug DSP core while Linux is running on A15.

Getting an below error:

omap_i2c 48070000.i2c: controller timed out

and some thermal shutdown error

Process am follow: first I connect A15 core, then trying to connect DSP core, but not able to connect.

Can I know proper steps to debug any core while A15 is running Linux.

Already take care of power control state of remoteproc by echo "on" for remoteproc2(DSP1) .

Regards,

Geek13

over 6 years ago

0 Nick Saulnier over 6 years ago

TI__Guru** 107810 points

Hello Geek13,

What board are you using?

What version of Processor SDK are you using?

Are you using the bare metal CSL example from pdk_am57xx_x_x_x/packages/ti/csl/example/mailbox/mailbox_sender_receiver_app, or are you using a different CSL application?

Regards,

Nick

0 Geek13 over 6 years ago in reply to Nick Saulnier

Expert 1215 points

Hi Nick,

Am using AM572x_EVM with latest TI-SDK for Linux. Yeah am using same CSL example you mention above.

Using same example am able to use MailBox between PRU & DSP cores.

But now am trying to access Mailbox between A15 and DSP.

Regards,

Geek13

0 Nick Saulnier over 6 years ago in reply to Geek13

TI__Guru** 107810 points

Hello Geek13,

1) When you successfully use Mailbox between PRU & DSP cores: Are you doing that with Linux on the ARM, or are you loading the firmware some other way (e.g. CCS?)

2) Have you verified that the DSP core is getting loaded properly by Linux RemoteProc?

Regards,

Nick

0 Nick Saulnier over 6 years ago in reply to Nick Saulnier

TI__Guru** 107810 points

On debugging:

Here are some IPC debugging tools and techniques on am57xx.

Regards,

Nick

0 Geek13 over 6 years ago in reply to Nick Saulnier

Expert 1215 points

Hi Nick,

I there any way to create Mailbox sender application on A15 core, so that am able to debug both A15 & C66x core using debugger.

Regards,

Geek13

0 Nick Saulnier over 6 years ago in reply to Geek13

TI__Guru** 107810 points

Hello Geek13,

Just checking: do you already have DSP <-> Linux ARM mailbox communication working? (It sounded like you did in https://e2e.ti.com/support/processors/f/791/t/855112 ). If so, how did you end up doing it?

If you do not have it working, let me know and I will dig into this more.

Regards,

Nick

0 Geek13 over 6 years ago in reply to Nick Saulnier

Expert 1215 points

Hi Nick,

Yeah am able to communicate between ARM & DSP core using Mailbox. I just need to take care of interruptEnable flag before sending new message. Issue is coming due to improper mailbox flag handling.

Regards,

Geek13

0 Nick Saulnier over 6 years ago in reply to Geek13

TI__Guru** 107810 points

Hello Geek13,

Glad to hear the code is working now! DSP <-> ARM Userspace communication with mailboxing sounds like it could be useful for a lot of customers. Would you be willing to post some code snippets for me? I am interested in turning this into a general example that future customers could look at.

Thanks,

Nick

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AM5728: Mailbox communication