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net: openthread: fix off-by-one error in settings offset calculation

OpenThread uses CONFIG_OT_PLAT_FLASH_PAGES_COUNT to calculate the # of
pages at the end of flash to use for storing OpenThread settings.

This calculation has an off-by-one error which sets the offset for
the storage area as 1 page of flash too low.

For example, on nRF52840:
- default setting for CONFIG_OT_PLAT_FLASH_PAGES_COUNT is 4
- flash size is 1MB (0x100000)
- flash page size is 4096 (0x1000)
- expected offset is 0xfc000

Using the current logic we get an offset of: 0xfb000

Fixes: #16339

Signed-off-by: Michael Scott <>
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mike-scott authored and jukkar committed May 22, 2019
1 parent 0d4290a commit a923c2f1be98cf317bfe5f4f468cea8560079417
Showing with 1 addition and 1 deletion.
  1. +1 −1 subsys/net/lib/openthread/platform/flash.c
@@ -33,7 +33,7 @@ otError utilsFlashInit(void)
pages_count = flash_get_page_count(flash_dev);

if (flash_get_page_info_by_idx(flash_dev,
pages_count - CONFIG_OT_PLAT_FLASH_PAGES_COUNT - 1, &info)) {
pages_count - CONFIG_OT_PLAT_FLASH_PAGES_COUNT, &info)) {


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