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db90e24326
An external project extending the Zephyr RTOS and its drivers may have subsystems that must use its own specific driver(s) when active. One example is the nRF5x NVMC that must be scheduled in between radio operations. A subsystem may also be dependent on its own drivers for security, real-time and/or because of hardware constrains. In order to not introduce non-Zephyr specific code into the Zephyr tree, an option is added to disable the in-tree drivers in Zephyr. Because Kconfig does not support a good way of de-selecting other symbols, a variable on the form `<DRIVER>_FORCE_ALT` is added as a dependency for each `<DRIVER>`. For example, the out-of-tree subsystem will select `FLASH_NRF_FORCE_ALT` to disable the in-tree driver. A solution for issue #8181 would open up for a more general solution, however #8181 requires significant effort. Support for out-of-tree drivers is added to Nordic drivers for clock_control, entropy and flash. A generic solution for this is desired. Issue #14527 is tracking that progress. Signed-off-by: Thomas Stenersen <thomas.stenersen@nordicsemi.no>
84 lines
2.5 KiB
Plaintext
84 lines
2.5 KiB
Plaintext
# Kconfig.nrf5 - nRF5 entropy generator driver configuration
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#
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# Copyright (c) 2018 Nordic Semiconductor ASA
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# Copyright (c) 2017 Exati Tecnologia Ltda.
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#
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# SPDX-License-Identifier: Apache-2.0
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config ENTROPY_NRF_FORCE_ALT
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bool
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depends on SOC_COMPATIBLE_NRF
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help
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This option can be enabled to force an alternative implementation
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of the entropy driver.
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if !ENTROPY_NRF_FORCE_ALT
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menuconfig ENTROPY_NRF5_RNG
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bool "nRF5 RNG driver"
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depends on SOC_COMPATIBLE_NRF
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select ENTROPY_HAS_DRIVER
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default y
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help
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This option enables the RNG peripheral, which is a random number
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generator, based on internal thermal noise, that provides a
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random 8-bit value to the host when read.
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if ENTROPY_NRF5_RNG
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config ENTROPY_NRF5_BIAS_CORRECTION
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bool "Enable bias correction (uniform distribution)"
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help
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This option enables the RNG bias correction, which guarantees a
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uniform distribution of 0 and 1. When this option is enabled, the time
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to generate a byte cannot be guaranteed.
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config ENTROPY_NRF5_THR_POOL_SIZE
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int "Thread-mode random number pool size"
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range ENTROPY_NRF5_THR_THRESHOLD 256
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default 8
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help
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Buffer length in bytes used to store entropy bytes generated by the
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hardware to make them ready for thread mode consumers.
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Please note, that size of the pool must be a power of 2.
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config ENTROPY_NRF5_THR_THRESHOLD
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int "Thread-mode random number pool low-water threshold"
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range 4 255
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help
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Low water-mark threshold in bytes to trigger entropy generation for
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thread mode consumers. As soon as the number of available bytes in the
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buffer goes below this number hardware entropy generation will be
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started.
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config ENTROPY_NRF5_ISR_POOL_SIZE
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int "ISR-mode random number pool size"
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range ENTROPY_NRF5_ISR_THRESHOLD 256
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default 16
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help
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Buffer length in bytes used to store entropy bytes generated by the
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hardware to make them ready for ISR consumers.
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Please note, that size of the pool must be a power of 2.
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config ENTROPY_NRF5_ISR_THRESHOLD
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int "ISR-mode random number pool low-water threshold"
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range 12 255
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help
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Low water-mark threshold in bytes to trigger entropy generation for
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ISR consumers. As soon as the number of available bytes in the
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buffer goes below this number hardware entropy generation will be
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started.
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config ENTROPY_NRF5_PRI
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int "RNG interrupt priority"
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range 0 2 if SOC_SERIES_NRF51X
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range 0 5 if SOC_COMPATIBLE_NRF52X
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default 2 if SOC_SERIES_NRF51X
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default 5 if SOC_COMPATIBLE_NRF52X
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help
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nRF5X RNG IRQ priority.
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endif # ENTROPY_NRF5_RNG
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endif # !ENTROPY_NRF_FORCE_ALT
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