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samples: fs: fat_fs: RAM disk in SRAM region for nrf52840dk

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Add overlay, for nrf52840dk, that reserves RAM in internal
SRAM using the DTS definition.
The sample with such region can be built with the config
file nrf52840dk_nrf52840_ram_disk_region.conf, but, instead
of automatically allocating memory, the Disk driver will
use the pre-defined region provided by the DTS overlay.

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
This commit is contained in:
Dominik Ermel 2024-03-04 14:51:30 +00:00 committed by Anas Nashif
parent d5e321516a
commit 919baf84d6
2 changed files with 62 additions and 0 deletions
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56
samples/subsys/fs/fs_sample/boards/nrf52840dk_nrf52840_ram_disk_region.overlay Normal file
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@ -0,0 +1,56 @@
/*
* Copyright (c) 2024 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
/* The SRAM is defined for nrf52840 in DTS to take entire 256KiB
* of RAM there is. We need some for the Disk, so we need to
* remove the original definition and replace it with smaller one.
*/
/delete-node/ &sram0;
/ {
soc {
/* This is defined based on dts and dtsi files for
* nrf52840 SoC; because we are not able to just
* change the size, what we have to do is to remove
* the sram0 definition, which is a combined result
* of all the sram0 referencing entries in included
* dts files, and replace it with our own.
* The first one is reduced in size original sram0:
*/
sram0: memory@20000000 {
compatible = "mmio-sram";
reg = <0x20000000 DT_SIZE_K(192)>;
};
/* The second one is 64kiB region taken out of SRAM,
* labeled here ram_disk, label can be anything,
* used later in disk definition.
*/
ram_disk: memory@20030000 {
compatible = "mmio-sram";
reg = <0x20030000 DT_SIZE_K(64)>;
};
};
msc_disk0 {
status="okay";
compatible = "zephyr,ram-disk";
/* Sample, to make things easier, mounts all FAT
* systems at "SD".
*/
disk-name = "SD";
/* Disk size is 64kB, 128 sectors of 512B, the minimal
* required by FAT FS.
*/
sector-size = <512>;
sector-count = <128>;
/* Here is the reference to the memory reserved for our
* disk using a phandle; note that we reference the
* region by label we have defined it above.
*/
ram-region = <&ram_disk>;
};
};

6
samples/subsys/fs/fs_sample/sample.yaml
View file

@ -37,6 +37,12 @@ tests:
extra_args:
- OVERLAY_CONFIG=boards/nrf52840dk_nrf52840_ram_disk.conf
- DTC_OVERLAY_FILE=boards/nrf52840dk_nrf52840_ram_disk.overlay
sample.filesystem.fat_fs.nrf52840dk_nrf52840_ram_disk_region:
build_only: true
platform_allow: nrf52840dk/nrf52840
extra_args:
- OVERLAY_CONFIG=boards/nrf52840dk_nrf52840_ram_disk.conf
- DTC_OVERLAY_FILE=boards/nrf52840dk_nrf52840_ram_disk_region.overlay
sample.filesystem.fat_fs.nrf52840dk_nrf52840.qspi:
build_only: true
platform_allow: nrf52840dk/nrf52840