secure_bootloader porting pca10056 to pca10056e

Question

hi, 
 im using nrf52811 customised board,for long range purpose im using softdevice s140 
 so i need to port secure boot loader pca10056 to pca10056e 
 can you please me reagarding this.

best reagrds, 
 siva.

Simonr · Accepted Answer

Hi 
 I did the math, and yes, I'm sure. The nRF52811 has 192kB of available Flash memory. The S140 SoftDevice takes up ~150kB of Flash, the bootloader binary is 24kB, and it requires at least 4kB for the bootloader settings page at least. Bringing us up to 178kB for just the SoftDevice and bootloader. Our simplest BLE application (ble_app_beacon) needs 20kB, which brings us up to a total of 198kB minimum . I also assume you'd like your application to do more than just advertise as a beacon as well, so you will need a SoC with more memory to have the S140 SoftDevice, an application, and a secure bootloader. 
 Best regards, 
 Simon

Simonr · Answer

Hi 
 Please check out the " Creating your own emulated project" section of the nRF52811 development user guide here. Please note that I'm not sure that you'll be able to fit both the S140 SoftDevice, an application, as well as a bootloader in the limited RAM and Flash memory that the nRF52811 can offer, and you might need to move your project to a larger device, like the nRF52833. 
 Best regards, 
 Simon

secure_bootloader porting pca10056 to pca10056e

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