RE: Bootloader RAM Start address calculation

Aadishri GS — Fri, 03 May 2019 12:09:04 GMT

[quote userid="7377" url="~/f/nordic-q-a/46897/bootloader-ram-start-address-calculation/185164"] The bootloader and application do not run at the same time, so they can use the same RAM region without any problems[/quote]

Very important Point!!

[quote userid="7377" url="~/f/nordic-q-a/46897/bootloader-ram-start-address-calculation/185164"] the RAM is shared[/quote]

Again, exactly what I was confused about

RE: Bootloader RAM Start address calculation

Einar Thorsrud — Fri, 03 May 2019 11:47:33 GMT

Hi,

1. Yes, that is safe, and probably what makes most sense. It does not matter where the bootloader RAM start address is, provided it is higher than what is used by the SoftDevice, and low enough that the ram size does not exceed the physical RAM. You do not have to take into account anything from the app. The bootloader and application do not run at the same time, so they can use the same RAM region without any problems.

2. We do not have any map of it, but t is just a single split: When the bootloader is running, the RAM is shared between the bootloader and SoftDevice, and the application does not use any RAM. When the application is running, the RAM is shared between the application and SoftDevice. The SoftDevice RAM usage depend on configuration. See Adjustment of RAM and Flash memory for details.