[riot-notifications] [RIOT-OS/RIOT] sam0 flashpage RWWEE flash support [WIP] (#10884)

Federico Pellegrin notifications at github.com
Tue Mar 19 04:34:06 CET 2019

> SAMD21G18A

According to [this datasheet](https://www.mouser.com/ds/2/813/Atmel-42181-SAM-D21_Datasheet-1079704.pdf) :  

> Note:The RWWEE address space is only available in Device Variant B. In Device Variant A this space is reserved

So that CPU should not have RWWEE and that space is reserved.

Annoyingly enough in the include for that CPU:

`include/vendor/saml21/include/saml21g18a.h:#define NVMCTRL_RWW_EEPROM_SIZE 0x2000UL /* 8 kB */`

So is the header containing wrong information? (that is the define I use to know if a chip has RWWEE or not at the moment)

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