LPC55S69 : read FFR at 150Mhz

[EugeneHiihtaja]

Hello !

Do I undestand right and FFR API have 96Mhz limitation ?

I try to read AC code from it at Core clock 150Mhz and it freeze at some point in this code :

FLASH_Init(&flashInstance);
FFR_Init(&flashInstance);

/* Read AC. */
memset((void*) activationCode, 0, sizeof(activationCode));
result = FFR_KeystoreGetAC(&flashInstance, (uint8_t*) activationCode);

I can see FLASH_Init have this line :

config->modeConfig.sysFreqInMHz = (uint32_t)kSysToFlashFreq_defaultInMHz; // 96 Mhz

But may be it is common case for Write and Erase as well.

Can flash memory reading via FFR api can be done at 150Mhz if I initialize FLASH_Init

with modified clock 150Mhz ?

Or I can read AC area directly becouse address of it is known. I think I should use FFR API

for have compatibility with next versions.

Regards,

Eugene

[ZhangJennie]

1B silicon can work under 150MHz. 96Mhz limit is for writing and erasing. not for read.

if you are sure you have problem when read. please send me your demo project and problem screenshot. I need reproduce the issue first.

[EugeneHiihtaja]

Hi ZhangJennie‌ !

Could you give some recommendation for usage of last 32KB flash block 98000-9FFFF of memory.

Test show that is not possible to execute code from it and write/erase some part of it.

Looks like 32KB chunk a real flash memory erasable unit and 512 sectors is just part of it.

FFR area part of it and as usually written via ISP commands by Boot-Rom.

Can I erase/write remain this 32KB block ( 98000- 9DE00)by my SW ( IAP) without any probability to loze FFR context in any scenario ?

Or better do not touch it at all for avoid any problems ?

Does it possible to lock this block somehow ( at secure side start up) that write/erase operations are not possible ?

E.g read only protection like ?

Regards,

Eugene

[ZhangJennie]

Is this related with your original question? Is your original question solved?

[EugeneHiihtaja]

Hi ZhangJennie‌ !

Yes, thank you !

It is almost new question.

br,Eugene

[ZhangJennie]

I made a test based on 1B part. No problem read/write/erase 98000- 9DE00

Have a great day,
Jun Zhang

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