AM2434: Request to reset R5FSS independently, excluding PRU_ICSSG reset

Chen Zhen-Wei

Part Number: AM2434

Hi,

In our development, we have a requirement to reset R5FSS without resetting PRU_ICSSG.

Therefore, we use the software warm reset method to reset the device, but it seems that PRU_ICSSG is also reset together.

The code is as follows:

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void AM243x_SW_MAIN_WARMRESET( void )
{
    uint32_t mCTRLMMR_RST_CTRL = 0;
    mCTRLMMR_RST_CTRL = CSL_REG32_RD(SW_MAIN_WARMRST_ADDRESS);
    mCTRLMMR_RST_CTRL = ( mCTRLMMR_RST_CTRL & 0xFFFFFFF0 ) | 0x00000006;
    CSL_REG32_WR( SW_MAIN_WARMRST_ADDRESS, mCTRLMMR_RST_CTRL );
}
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void AM243x_SW_MAIN_WARMRESET( void )
{
	uint32_t mCTRLMMR_RST_CTRL = 0;

	mCTRLMMR_RST_CTRL = CSL_REG32_RD(SW_MAIN_WARMRST_ADDRESS);
	mCTRLMMR_RST_CTRL = ( mCTRLMMR_RST_CTRL & 0xFFFFFFF0 ) | 0x00000006;
	CSL_REG32_WR( SW_MAIN_WARMRST_ADDRESS, mCTRLMMR_RST_CTRL );
}

Is there any method to reset R5FSS without resetting PRU_ICSSG?

over 1 year ago

0 Shivasharan Nagalikar over 1 year ago

TI__Expert 8160 points

Hi Chen,

We will check on this and update. Sorry for the delay as experts were out on this topic.

Best Regards, Shiv

0 Rijohn Pius over 1 year ago

TI__Intellectual 2260 points

Hi Chen,

SW_MAIN_WARMRST Resets PRU_ICSSG by default. In order to reset R5FSS without resetting PRU_ICSSG, we have to configure PRU_ICSSG as RESET ISOLATED. This is configured by generating the following reset_isolation_request interrupts to PRU_ICSSG:

pr0_rst_reset_iso_req for PRU_ICSSG0 Interrupt Controller
pr1_rst_reset_iso_req for PRU_ICSSG1 Interrupt Controller

Please refer to AM243-TRM section 6.4.7 PRU_ICSSG Local INTC for more details on generation of internal interrupts to the PRU_ICSSG interrupt controller.

Thanks & Regards,
Rijohn

0 Chen Zhen-Wei over 1 year ago in reply to Rijohn Pius

Prodigy 55 points

Hi Rijohn,

Thanks for your reply.

Is there any example code or a set of configuration procedures available for PRU_ICSSG as RESET ISOLATED?

Best Regards

0 Rijohn Pius over 1 year ago in reply to Chen Zhen-Wei

TI__Intellectual 2260 points

Hi Chen,

We will check on this and update you.

Regards,
Rijohn

0 Nilabh Anand over 1 year ago in reply to Rijohn Pius

TI__Mastermind 36293 points

Hi Chen,

Please use the below code as refernce. Please note you need to modify the PRU firmware with a firmware that you are using. Let me know if you have any query

/cfs-file/__key/communityserver-discussions-components-files/908/reset_5F00_isol_5F00_pru_2800_1_2900_.c

0 Chen Zhen-Wei over 1 year ago in reply to Nilabh Anand

Prodigy 55 points

Hi,

Thanks for your reply.

Regarding the example code, I have some questions to inquire about:

1. Why is LPSC_MODULE_NO multiplied by 4?

2. It seems that enable only RESETISO is sufficient to activate the ICSSG0 Isolation Reset. Why is it also necessary to enable the BLKCHIP1RST bit? What does enable the BLKCHIP1RST bit represent?

3. Similarly, why is it necessary to send ISO_Request, as shown below?

Best Regards

0 Nilabh Anand over 1 year ago in reply to Chen Zhen-Wei

TI__Mastermind 36293 points

Hi Chen,

Please note that reset isolation needs to be done by making SYSFW know that if should not reset PRU, above settings are necessary for the same for details on register description please refer to the TRM.

I do not have answer to the questions handy, I will look up the details and share by early next week.

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AM2434: Request to reset R5FSS independently, excluding PRU_ICSSG reset