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The clock from the ARM timer is derived from the system clock. This clock can
change dynamically e.g. if the system goes into reduced power or in low power
mode. Thus the clock speed adapts to the overall system performance
capabilities. For accurate timing it is recommended to use the system timers.
if BSP_CLOCK_USE_SYSTEMTIMER = 1, use the System Timer, otherwise use the ARM
Timer.
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Use the existing WRITE_SR() abstraction to access the interrupt group 0 and 1
enable registers. This fixes the build for the AArch32 target.
Add BSP options which define the initial values of CPU Interface registers.
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Propagate the group defined cppflags, cflags, and cxxflags from parent groups
to child items through the build item context.
Update #4670.
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Separate the Interrupt Manager implementation from the generic Arm GICv3
support. Move parts of the Arm GICv3 support into a new header file. This
helps to support systems with a clustered structure in which multiple GICv3
instances are present. For example, two clusters of two Cortex-R52 cores where
each cluster has a dedicated GICv3 instance.
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This avoids a function call overhead in the interrupt dispatching.
Update #4202.
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These files are required for libbsd to build against the AArch64 A53
BSPs.
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This adds an AArch64 basic BSP based on Qemu's Cortex-A53 emulation with
interrupt support using GICv3 and clock support using the ARM GPT.
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