[OOB 5.6] Program hangs by pressing USER button on DISCO_F429ZI

[toyowata]

Description

• Type: Bug
• Related issue: none
• Priority: Major

---

Bug

Target
DISCO_F429ZI

Toolchain:
GCC_ARM

Toolchain version:
arm-none-eabi-gcc.exe (GNU Tools for ARM Embedded Processors 6-2017-q1-update) 6.3.1 20170215 (release) [ARM/embedded-6-branch revision 245512]

mbed-cli version:
1.2.0

mbed-os sha:
$ mbed ls
mbed-os-example-uvisor (079c015)
`- mbed-os (a4056fb8bf3e)

DAPLink version:
Version: 0221
Build: Nov 19 2015 15:23:07

Expected behavior

Secure LED toggles by pressing USER button.

Actual behavior

When pressing USER button, program hangs most of time. See log file below:

***** IRQ blinky uVisor example *****
Main loop count: 0
Main loop count: 1
Main loop count: 2
Main loop count: 3

Pressed switch, printing from interrupt - LED now on.

Note that I did not see any problem with master branch, only in mbed-os-5.6-oob branch. Also, K64F does not have such an issue in mbed-os-5.6-oob branch.

Steps to reproduce

$ mbed import mbed-os-example-uvisor
$ cd mbed-os-example-uvisor
$ mbed update mbed-os-5.6-oob
$ mbed compile -m DISCO_F429ZI -t GCC_ARM -f

[ciarmcom]

ARM Internal Ref: IOTSEC-443

[Patater]

This is caused by ARMmbed/uvisor#420

The version of Mbed OS being tested with attempts to sleep from unprivileged mode, but that causes an access violation.

[toyowata]

Fixed in the mbed-os-5.6-oob2.