How to read the data stored in "shared_data" area?

[n4ka9avva]

Hi, all

I'm developing a private product with MCUboot and Mbed OS on FRDM-K64F board. I'd like to leverage shared_data area to pass some data from MCUboot to runtime software.

I tried it following this demo project and then, I might have succeeded to save the data into shared_data area. But I have no idea to read the data with runtime software.

In the case of demo example, the shared area was allocated to the range from 0x2002_FF80 to 0x2003_0000. I prepared a data buffer, which size is 0x80, and then attempted to read by memcpy function like memcpy(&buffer, (void*)0x2002_FF80, sizeof(buffer)). However, I got Mbed OS Fault Handler below. I guess the direct access to RAM area should not be recommended.

Does anyone know appropriate access method to read shared data?
Thank you for your help in advance.

++ MbedOS Fault Handler ++

FaultType: HardFault

Context:
R   0: 2002FF70
R   1: 2022FF80
R   2: 20230000
R   3: 2002FF6F
R   4: 00000000
R   5: 00000000
R   6: FFFFFFFF
R   7: 00000000
R   8: 00000000
R   9: 00000000
R  10: 20020000
R  11: 00000000
R  12: 00000000
SP   : 2002FF58
LR   : 00025C83
PC   : 000262B6
xPSR : 81000000
PSP  : 00000000
MSP  : 2002FEF0
CPUID: 410FC241
HFSR : 40000000
MMFSR: 00000000
BFSR : 00000082
UFSR : 00000000
DFSR : 00000000
AFSR : 00000000
BFAR : 2022FF80
Mode : Thread
Priv : Privileged
Stack: MSP

-- MbedOS Fault Handler --



++ MbedOS Error Info ++
Error Status: 0x80FF013D Code: 317 Module: 255
Error Message: Fault exception
Location: 0x262B6
Error Value: 0x1FFF0400
For more info, visit: https://mbed.com/s/error?error=0x80FF013D&tgt=K64F
-- MbedOS Error Info --