1. Rename m2351_stddriver_sup.h/c to stddriver_secure.h/.c for naming consistency
2. Add hal_secure.h to include hal-exported secure functions
3. Change return/argument type in secure functions:
(1) Change int to int32_t
(2) Change PinName to int32_t
(3) Change time_t to int64_t
4. Update secure lib/bin accordingly
1. Power down RTC access from CPU domain in rtc_free. After rtc_free, RTC gets
inaccessible from CPU domain but keeps counting.
2. Fix RTC cannot cross reset cycle.
To change TRNG security state, we need to:
1. Change CRPT/CRYPTO bit in NVIC/SCU in partition_M2351.h
2. Add/remove TRNG in device_has list in targets.json to match partition_M2351.h
NSC location has the following requirements:
1. By IDAU, 0~0x4000 is secure. NSC can only locate in 0x4000~0x10000000.
2. Greentea flash IAP uses last 4 sectors for its test. Avoid this range.
3. Greentea NVSTORE uses last 2 sectors or 4KB x 2 for its test. Avoid this range.
In Mbed OS, page size is program unit, which is different than FMC definition.
After fixing page size, we can pass NVSTORE test (mbed-os-features-nvstore-tests-nvstore-functionality).
1. Replace SYS_ResetModule/CLK_SetModuleClock/CLK_EnableModuleClock/CLK_DisableModuleClock with TrustZone-aware versions.
2. Configure all UART to secure
3. Support asynchronous transfer
4. Remove sleep management code, which has been replaced with Sleep Manager.
The rework includes the following:
1. Remove ticker overflow handling because upper layer (mbed_ticker_api.c) has done with it.
This makes us_ticker/lp_ticker implementation more succinct and avoids potential error.
2. Refine timer register access with low-power clock source
1. Revise NU_PORT_BASE to be TrustZone-aware
2. Add TrustZone-aware NU_GET_GPIO_PIN_DATA/NU_SET_GPIO_PIN_DATA to replace GPIO_PIN_DATA
3. Revise pin_function to be TrustZone-aware
All modules are configured to non-secure except:
1. TIMER0/1 hard-wired to secure and TIMER2/3 reserved for non-secure.
2. PDMA0 hard-wired to secure and PDMA1 reserved for non-secure.
3. RTC configured to secure and shared to non-secure through NSC.
4. CRYPTO configured to secure and shared to non-secure through NSC.
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Deepika
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