Safety Sboot CMU FC testing - plugin HFREF and LFREF ref values are not as per the calculations

[Irshad2225]

Hi, 

For CMU_FC_14, CMU_FC_15, and CMU_FC_21, the reference LFREF and HFREF values are too high to match the calculated values.
In sBoot_PtocmuFcArray, LFREF starts with zero.
I have observed that, with the minimum frequency as zero, LFREF can be 3. not zero.

Providing below reference values from the debugger.
sBoot_PtocmuFcArray values - where the calculated HFREF(sBoot_maxFreqsArray ) & LFREF(Boot_minFreqsArray) are being compared with .

Providing HFREF & LFREF calculations below.

	clock monotor	FIRC_CLF	Fref ~%	F ref MHz	Monitored clock	Fmon ~%	BusClock	F mon,F bus MHz	RCCR[REF_CNT]	Fmon_var_Max	Fmon_var_Min	Fref_var_Max	Fref_var_Min	HTCR[HFREF]	LTCR[LFREF]
10	CMU_FC_14_GMAC0_TX_CLK	FXOSC_CLK	0.005	40	GMAC0_TX_CLK	5	GMAC0_TX_CLK	9.6	80	10.08	9.12	40.002	39.998	24	15
11	CMU_FC_15_GMAC_TS_CLK	FXOSC_CLK	0.005	40	GMAC0_TS_CLK	5	GMAC0_TS_CLK	9.6	80	10.08	9.12	40.002	39.998	24	15
16	CMU_FC_21_GMAC0_RX_CLK	FXOSC_CLK	0.005	40	GMAC0_RX_CLK	5	GMAC0_RX_CLK	25	80	26.25	23.75	40.002	39.998	56	44

Above are the HFREF and LFREF values as per my calculations.

Table. Comparison between calculated values vs sBoot_PtocmuFcArray 

Calculated values	sBoot_PtocmuFcArray values
HFREF	LFREF	HFREF	LFREF
24	15	16777215	0
24	15	16777215	0
56	44	16777215	0

The reference values cannot be achieved even with the higher frequencies.

This might not be a calculation issue, as the same formula has been applied to the remaining CMU_FCs and those got passed.

Is this an issue in plugins/configurations???

[Joey_z]

Hi, Irshad2225

Thank you for contacting us.

Refer to your picture, it is unable for current CMU if the FCE=0. In addition, The REF_CNT value is 0.

BR

Joey

[Irshad2225]

Hi Joey,

Even when the REF_CNT = 100 or 80 is configured, the above-mentioned CMUs' LFREF and HFREF remain the same with REF_CNT=0, only to the CMU_FC_14, CMU_FC_15, and CMU_FC_21.

[Irshad2225]

I have enabled FCE too, in the code, as it was not getting enabled automatically.
Mentioned in the below thread:
https://community.nxp.com/t5/S32G/Safety-Sboot-CMU-FC-testing-Not-enabling-CMU-FC-check-before/m-p/2...

[Irshad2225]

[Joey_z]

hi, Irshad2225

Thank you for your information.

I understand what you mean. Since these API in Safety are for customers to use, in order to better support you in debugging and identifying problems, could you share your code?

You can provide this information easier by creating a new case at: https://support.nxp.com.

Can attach this link: Safety Sboot CMU FC testing - plugin HFREF and LFREF ref values are not as per the calculations - NX... inter to the new ticket. 

BR

Joey

[Irshad2225]

Hi Joey,

Does sboot require, pheripheral initialisations before testing configurations?.

Below subchapter is mentioned from sboot_UM.pdf.
6.5.1 Function Calls during Start-up
The sBoot software does not require any initialisation function to be called during start.

Regards,
Irshad

[Joey_z]

hi,Irshad2225

Thank you for your information.

According to The manual, The sBoot software does not require any initialization function to be called during start_up. However, Software drivers for the PMIC and it's communication interface must be present in the system and properly initialized before sBoot can start testing the FCCU error output
pins.

Hope it can help you.

BR

Joey