LPC55Sx exclude flash area from security boot

[Bebe]

I'm using LPC55S16 with security boot (the security boot check is made by the NXP built in bootloader). The sb file is generated with NXP Secure Provisioning Tool. My appalication has an internal flash range which has to be modified during SW run in some cases. Is there a possibility to skip a flash area from security boot check? If yes, then can you please help me how to exclude it.

Memory layout:

0x00000000 - 0x00005200 -> security boot protected

0x00005200 - 0x00005A00 -> not security boot protected

0x00005A00 -                        -> security boot protected

[Bebe]

Thanks Marek

[marek-trmac]

Hi Tamas,

I'm afraid it is not possible to exclude any flash range (0x00005200 - 0x00005A00) from the secure boot validation.

If you have application located at 0x00000000 - 0x00005200, you can add additional content, which is not validated during boot. There should be API in ROM available, that can be used to validate flash, so you can call the API from you validated application to validate the rest (i.e. in your case 0x00005A00 - ).