boot mode is configured
1. Explicitly define the .rtc_reserved section to ensure RTC data
that requires fixed address is correctly placed and does not
conflict with other sections
2. When legacy boot is configured, vecbase must also be set and
clear the BSS section
3. Cache must be disabled during Flash operations, so all
Flash-operation-related functions must be placed in IRAM
(internal RAM). Update the linker script for legacy boot mode
Signed-off-by: nuttxs <zhaoqing.zhang@sony.com>
fa2d2b8898