topic Re: PN7462: unable to program flash in NFC

PN7462: unable to program flash

piergiuseppe_tu — Wed, 30 Oct 2019 15:03:36 GMT

Hello.

I am no longer able to program the flash of some PN7462 parts.

I know about SECROW feature, which I didn't intentionally change using the phhalSysSer_OTP_SecrowConfig call.
I would like to know the address of the SECROW word in the reserved EEPROM just to verify it isn't protected.

Furthermore, in section 3.2.1 “PN7462 family ROM primary download EEPROM config” of the "family Software User Manual" (UM10913), table 4 shows some parameters in the range 0-3 that manage access to the EEPROM and to the flash; these parameters are of course stored in the reserved part of EEPROM: I would like to know the exact (undocumented) address of these parameters, to further verify my issue.

Just to add more elements, on affected parts I'm able to read/write EEPROM and attach to the target using SWD: the only problem is programming the flash, which can only be read.

Thank you in advance.

KR,

Re: PN7462: unable to program flash

Jonathan_Iglesias — Wed, 06 Nov 2019 17:17:44 GMT

Hi Piergiuseppe Tundo,

to know the status of the SECROW you can use the phhalSysSer_OTP_SecrowConfig if you send the first parameter as 0 is to set configuration and if you send 1 is to get the configuration

please check the example :

phStatus_t status;
phhalSysSer_Secrow_Config_t SecRow;
phUser_MemSet(&SecRow , 0 , sizeof(SecRow));
status = phhalSysSer_OTP_SecrowConfig (PH_SYSRV_GET_DATA, &SecRow);

Jonathan

Re: PN7462: unable to program flash

piergiuseppe_tu — Thu, 07 Nov 2019 08:04:28 GMT

Hi Jonathan, thank you for your interest.

I know about get feature of phhalSysSer_OTP_SecrowConfig, but:

unfortunately to apply such solution I'd need to write a program into flash, which isn't possible anymore;
to overcome previous point, I changed the default linker configuration file in order to place and run that program from EEPROM, but the get variant of phhalSysSer_OTP_SecrowConfig doesn't return.

Finally I managed to place and run in EEPROM a program to read the reserved area of EEPROM itself, and it succeeded, so now I know the content of reserved area, but I need to know how to decode that content (or at least where SECROW is encoded).

Peppe