141 lines
4.5 KiB
ReStructuredText
141 lines
4.5 KiB
ReStructuredText
Multicore Test App
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##################
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These applications aim to provide an easy way to test the PM multicore support
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from Quark SE. It implements two common flows: 1) LMT core is idle while ARC
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core is busy so the system is not put on DEEP SLEEP mode, and 2) LMT core is
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idle when ARC core is also idle so the system enters in DEEP SLEEP mode.
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These applications implement a master/slave approach where LMT application
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plays the master role while ARC application plays the slave. The master is the
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one which controls the wakeup device (in this example it is the RTC) and
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actually puts the system in deep sleep mode.
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To keep the synchronization logic simple and demonstrate the multi-core
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coordination, we do not handle any events in ARC other than the notification
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IPM from LMT. Handling events in ARC itself may need more complex communication
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and synchronization logic between the applications of the the 2 cores. For
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example, such an implementation should be able to handle the corner case of
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ARC getting woken up by some event when LMT is in the process of putting the
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SOC in deep sleep.
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In the following section the working mechanism from both ARC and LMT
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applications are described, and building and wiring instructions are
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provided.
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test/power/multicore/arc
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************************
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The ARC application is very simple, it keeps the system bouncing between 'busy'
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and 'idle' states. The application keeps the system busy for 10 seconds and
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then idle until woken up by IPM event from LMT. When system goes into idle,
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the application puts the system in SYS_POWER_STATE_DEEP_SLEEP_2 state which
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allows LMT core to put the system in sleep mode.
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The application uses UART_0 as console output device so, in order to be able
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to see ARC output messages, make sure you have attached a serial cable to
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UART_0. In 'quark_se_c1000_ss_devboard', UART_0 pins are in J14 header. The
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table below shows the wiring instructions.
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+---------+------------------+
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| J14 PIN | SERIAL CABLE PIN |
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+=========+==================+
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| 3 | RXD |
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+---------+------------------+
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| 5 | TXD |
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+---------+------------------+
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| 11 | GND |
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+---------+------------------+
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If your wiring is correct, you should see the following output on console:
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::
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ARC: Quark SE PM Multicore Demo
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ARC: busy
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ARC: idle
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ARC: busy
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ARC: idle
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ARC: busy
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ARC: idle
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ARC: busy
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...
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To build the ARC application, run the following commands:
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::
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$ cd tests/power/multicore/arc/
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$ make
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test/power/multicore/lmt
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************************
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The LMT application is very simple and also keeps the system bouncing between
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'busy' and 'idle'. When the system goes into idle, the application tries to
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put the system in DEEP_SLEEP state. If ARC core is busy, it fails. If ARC core
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is idle, it succeeds.
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When 'TEST_CASE=sleep-success', the application will be busy for 15 seconds
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and idle for 5. This means that ARC core will be idle when LMT core tries to
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enter in DEEP_SLEEP, and it will succeed. In this case, the output on your
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console should look like this:
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::
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LMT: Quark SE PM Multicore Demo
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LMT: busy
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LMT: idle
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LMT: Try to put the system in SYS_POWER_STATE_DEEP_SLEEP_2 state
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LMT: Succeed.
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LMT: busy
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LMT: idle
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LMT: Try to put the system in SYS_POWER_STATE_DEEP_SLEEP_2 state
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LMT: Succeed.
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LMT: busy
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LMT: idle
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LMT: Try to put the system in SYS_POWER_STATE_DEEP_SLEEP_2 state
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LMT: Succeed.
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...
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To build the LMT application which tests the "success" path, run the following
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commands:
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::
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$ cd tests/power/multicore/lmt TEST_CASE=sleep-success
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$ make
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When 'TEST_CASE=sleep-fail', application is busy for 5 seconds and idle for 15
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seconds. This means that ARC core will be busy when LMT core tries to enter in
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DEEP_SLEEP, and it will fail. In this case the output on your console should
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look like this:
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::
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LMT: Quark SE PM Multicore Demo
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LMT: busy
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LMT: idle
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LMT: Try to put the system in SYS_POWER_STATE_DEEP_SLEEP_2 state
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LMT: Failed. ARC is busy.
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LMT: busy
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LMT: idle
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LMT: Try to put the system in SYS_POWER_STATE_DEEP_SLEEP_2 state
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LMT: Failed. ARC is busy.
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LMT: busy
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LMT: idle
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LMT: Try to put the system in SYS_POWER_STATE_DEEP_SLEEP_2 state
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LMT: Failed. ARC is busy.
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...
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To build the LMT application which tests the "failure" path, run the following
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commands:
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::
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$ cd tests/power/multicore/lmt
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$ make TEST_CASE=sleep-fail
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The application uses UART_1 device as console output device, which is the
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default console device.
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