Zephyr board: nrf54l15dk_nrf54l15_cpuapp
Hi, we have a custom SPI NAND flash driver and are trying to create an external flash partition for our littlefs file system.
When we use sysbuild / CONFIG_BOOTLOADER_MCUBOOT (which I believe enables the partition manager) then zephyr overwrites the external flash partition and it forces littlefs to use the rram instead of the expected external flash partition we setup in our overlay (see below).
But, if we disable sysbuild / mcuboot then we are able to use the external flash partition as expected.
Here is our overlay
see
ittlefs0: littlefs
mx35uf4: mx35uf4g24ad
// gpio expander has some wonky pin mapping after pin 10
#include "gpio_expander_pin_map.h"
/ {
chosen {
zephyr,console = &uart00;
zephyr,shell-uart = &uart00;
zephyr,uart-mcumgr = &uart00;
zephyr,bt-mon-uart = &uart00;
zephyr,bt-c2h-uart = &uart00;
zephyr,flash-controller = &rram_controller;
zephyr,flash = &cpuapp_rram;
zephyr,ieee802154 = &ieee802154;
};
// littlefs_partition is from mx35uf4 NAND flash (see below)
littlefs0: littlefs {
compatible = "zephyr,fstab,littlefs";
mount-point = "/lfs";
partition = <&littlefs_partition>;
read-size = <4096>;
prog-size = <4096>;
cache-size = <4096>;
lookahead-size = <256>;
block-cycles = <512>;
automount;
};
};
/delete-node/ &mx25r64;
&spi00 {
status = "disabled";
};
/* NOTE: must disable uart20 to use spi20 for nand spi flash */
&spi20 {
status = "okay";
cs-gpios = <&gpio2 5 GPIO_ACTIVE_LOW>;
pinctrl-0 = <&spi20_default>;
pinctrl-1 = <&spi20_sleep>;
pinctrl-names = "default", "sleep";
/* see local driver in drivers/flash/spi_nand.c */
mx35uf4: mx35uf4g24ad@0 {
compatible = "jedec,spi-nand";
reg = <0>;
spi-max-frequency = <8000000>; //8000000
id = [c2 f5];
cs-wait-delay = <0>;
page-size = <4096>;
flash-size = <536870912>; // 4Gbit
ecc-bits = <8>;
status = "okay";
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;
#size-cells = <1>;
littlefs_partition: partition@0 {
label = "nand_storage";
reg = <0x00000000 0x02000000>; // 0x02000000 for 32MB example
};
};
};
};
/* rest of overlay removed */
here is our prj.conf
# General Kernel config CONFIG_REBOOT=y CONFIG_DEBUG_THREAD_INFO=y CONFIG_THREAD_NAME=y # allows us to use k_thread_name_set # fs_dirent structures are big. CONFIG_MAIN_STACK_SIZE=4096 # MCUBoot CONFIG_BOOTLOADER_MCUBOOT=y CONFIG_MCUBOOT_GENERATE_UNSIGNED_IMAGE=y CONFIG_MCUBOOT_GENERATE_CONFIRMED_IMAGE=y # Logging CONFIG_LOG=y CONFIG_LOG_CMDS=y CONFIG_LOG_PROCESS_TRIGGER_THRESHOLD=1 # Enable the FS log backend CONFIG_LOG_MODE_DEFERRED=y CONFIG_LOG_BACKEND_FS=y CONFIG_LOG_BACKEND_FORMAT_TIMESTAMP=y CONFIG_LOG_BACKEND_FS_AUTOSTART=y CONFIG_LOG_BACKEND_FS_DIR="/lfs" CONFIG_LOG_BACKEND_FS_FILE_SIZE=4096 # Increase log processing thread stack (try 4096 first, bump to 8192 if needed) CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=4096 # Binary descriptors (used for version management in the build system) CONFIG_BINDESC=y CONFIG_BINDESC_DEFINE=y CONFIG_BINDESC_DEFINE_BUILD_TIME=y CONFIG_BINDESC_BUILD_DATE_TIME_STRING=y CONFIG_BINDESC_DEFINE_VERSION=y CONFIG_BINDESC_APP_VERSION_STRING=y # heap 32768 CONFIG_HEAP_MEM_POOL_SIZE=8192 # shell CONFIG_SHELL=y CONFIG_SHELL_PROMPT_UART="shell:~$ " CONFIG_LOG_PRINTK=n CONFIG_SHELL_STACK_SIZE=4096 # flash config CONFIG_FLASH=y CONFIG_FLASH_MAP=y CONFIG_FLASH_PAGE_LAYOUT=y # littlefs filesystem config CONFIG_FILE_SYSTEM=y CONFIG_FILE_SYSTEM_LITTLEFS=y # NOTE: 8192 isn't enough for CONFIG_FS_LITTLEFS_FC_HEAP_SIZE, fs wont work well, use 12kb CONFIG_FS_LITTLEFS_FC_HEAP_SIZE=12288 CONFIG_FILE_SYSTEM_MKFS=y CONFIG_FS_LITTLEFS_PROG_SIZE=4096 CONFIG_FS_LITTLEFS_CACHE_SIZE=4096 CONFIG_FS_LITTLEFS_READ_SIZE=4096 CONFIG_FS_LITTLEFS_LOOKAHEAD_SIZE=256 # littlefs uses NAND Flash IC CONFIG_SPI=y CONFIG_SPI_NOR=n CONFIG_SPI_NAND=y # SW ECC required CONFIG_SPI_NAND_SOFTWARE_ECC=y # Optional for "fs" shell commands CONFIG_FILE_SYSTEM_SHELL=y
what are we doing wrong?
