a60d88e5cc
This commit workarounds the BBRAM status register write issue in npcx4: A write operation to the BKUP_STS register might disable write to all the Battery-Backed RAM (BBRM). The workaround is to perform a fake read from the BKUP_STS register after every write to this register. Signed-off-by: Jun Lin <CHLin56@nuvoton.com>
27 lines
811 B
Plaintext
27 lines
811 B
Plaintext
# Copyright (c) 2021 Google Inc
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# SPDX-License-Identifier: Apache-2.0
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config BBRAM_NPCX
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bool "Nuvoton NPCX embedded controller (EC) Battery-backed RAM drivers"
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default y
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depends on DT_HAS_NUVOTON_NPCX_BBRAM_ENABLED
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help
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This option enables the BBRAM driver for NPCX family of processors.
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config BBRAM_NPCX_EMUL
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bool "Emulator for the NPCX BBRAM driver"
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default y
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depends on BBRAM_NPCX
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depends on EMUL
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help
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Enable the emulator for the NPCX BBRAM.
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config BBRAM_NPCX_STATUS_REG_WRITE_WORKAROUND
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bool
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default y if SOC_SERIES_NPCX4
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help
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Workaround the issue documented in NPCX49nF errata rev1_5, No.2.30.
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A write operation to the BKUP_STS register might disable write to all
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the Battery-Backed RAM. The workaround is to read the BKUP_STS
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register after every write to this register.
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