zephyr/drivers/flash/Kconfig.it8xxx2
Peter Marheine d4549ed808 it8xxx2: generalize ILM support
Executing code out of RAM on IT8xxx2 requires that the relevant
addresses be mapped onto the CPU's instruction memory bus, referred to
by ITE documentation as Instruction Local Memory (ILM). ILM mappings
configure blocks of RAM to be used for accesses to chosen addresses when
performing instruction fetch, instead of the memory that would normally
be accessed at that address.

ILM must be used for some chip features (particularly Flash
self-programming, to execute from RAM while writing to Flash), and has
historically been configured in the Flash driver. The RAM for that was
hard-coded as a single 4k block in the linker script.  Configuring ILM
in the flash driver is confusing because it is used by other SoC code as
well, currently in code that cannot depend on the Flash being functional
or in hand-selected functions that seem performance-critical.

This change moves ILM configuration to a new driver and dynamically
allocates RAM to ILM in the linker script, allowing software use of the
entire 64k RAM depending on configuration.  This makes ILM configuration
more discoverable and makes it much easier to correctly support the
CODE_DATA_RELOCATION feature on this SoC.

Signed-off-by: Peter Marheine <pmarheine@chromium.org>
2022-10-21 20:31:47 +02:00

15 lines
443 B
Plaintext

# FLASH configuration options
# Copyright (c) 2021 ITE Corporation. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0
config SOC_FLASH_ITE_IT8XXX2
bool "ITE IT8XXX2 flash driver"
default y
depends on DT_HAS_ITE_IT8XXX2_FLASH_CONTROLLER_ENABLED
select SOC_IT8XXX2_USE_ILM
help
The flash driver includes support for read, write and
erase flash operations. It also supports protection.
The it8xxx2 flash size is 1M byte.