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H A Dtzc380.c113110f80bd927b94c9c33ad4a8df9c7a6db7dcd Tue Apr 04 13:31:19 UTC 2023 Philip Oberfichtner <pro@denx.de> TZASC: Allow 32KB region size

According to the ARM TZC-380 Technical Reference Manual, 32KB is the
minimum region size [1]. But before this patch, tzc_auto_configure()
allowed only 64KB as minimum.

(pow > 15) implies the following:
region_size = (1ULL << pow) = (2^pow) > 32KB

After this patch, (pow >= 15) gives us region_size >= 32KB.

Tested on i.MX6UL.

Link: [1] https://developer.arm.com/documentation/ddi0431/c/programmers-model/register-descriptions/region-attributes--n--register?lang=en
Signed-off-by: Philip Oberfichtner <pro@denx.de>
Acked-by: Clement Faure <clement.faure@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>