Hello,
I try to figure out, why a certain IO pin shows some pattern at startup. After using JLinkExe to set a watchpoint at the configuration register of the pin (GDB was crashing reproducible), I figured out, that the pin was used by a UART driver configured into the mcuboot bootloader.
I found this article here: https://devzone.nordicsemi.com/f/nordic-q-a/93879/kernel-panic-when-i-remove-uart0_default
But when I apply that configuration, the bootloader ends up, not being able to access a flash ares (I would guess, that this is the external QSPI flash):
00> [00:00:00.385,498] <inf> [ma*** Booting MCUboot v2.1.0-dev-4594a8693738 *** 00> *** Using nRF Connect SDK v2.8.0-a2386bfc8401 *** 00> *** Using Zephyr OS v3.7.99-6f7193b063f4 *** 00> [00:00:00.290,222] <inf> mcuboot: Starting bootloader 00> [00:00:00.290,710] <err> mcuboot: Failed to open flash area ID 3 (image 0 slot 1): -19, cannot continue
Target hardware is a custom nrf5340 design.
How to disable the usage of the UART, without disabling the QSPI flash driver?
My mcuboot.overlay:
&qspi {
/*
* Name of the device has to be mx25r64; Otherwise,
* the driver is not found during linking
*/
mx25r64: mx25r6435f@0 {
/* flash_ext: MT25QU01GBBB@0 {*/
compatible = "nordic,qspi-nor";
reg = < 0x0 >;
writeoc = "pp4o";
readoc = "read4o";
sck-frequency = < 90000000 >;
jedec-id = [ 20 BB 21 ];
sfdp-bfp = [ E5 20 F1 FF FF FF FF 03 44 EB 08 6B 08 3B 04 BB EE FF FF FF FF FF 00 FF FF FF 00 FF 0C 20 0F 52 10 D8 00 FF 23 72 F5 00 82 ED 04 CC 44 83 68 44 30 B0 30 B0 F7 C4 D5 5C 00 BE 29 FF F0 D0 FF FF ];
/* This is the size in bits and corresponds to the length of
* mcuboot_secondary + mcuboot_secondary_1 in pm_static.yml
*/
size = < 0x900000 >;
has-dpd;
t-enter-dpd = < 0x2710 >;
t-exit-dpd = < 0x88b8 >;
address-size-32;
};
};
/ {
chosen {
nordic,pm-ext-flash = &mx25r64;
/* nordic,pm-ext-flash = &flash_ext;*/
};
};
&uart0 {
status = "disabled";
};
mcuboot.config:
# Configure MCUboot features CONFIG_BOOT_MAX_IMG_SECTORS=512 #CONFIG_MCUBOOT_DOWNGRADE_PREVENTION=y CONFIG_BOOT_ECDSA_TINYCRYPT=y CONFIG_BOOT_SWAP_USING_MOVE=y # Enable flash simulator CONFIG_PCD_APP=y CONFIG_FLASH_SIMULATOR=y CONFIG_FLASH_SIMULATOR_DOUBLE_WRITES=y CONFIG_FLASH_SIMULATOR_STATS=n CONFIG_NORDIC_QSPI_NOR=y CONFIG_NORDIC_QSPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096 CONFIG_BOOT_IMAGE_ACCESS_HOOKS=y CONFIG_BOOT_IMAGE_ACCESS_HOOK_NRF5340=y # # This configuration works, but is quite complicated (especially as it # adds multithreading to a bootloader) # CONFIG_LOG=y CONFIG_USE_SEGGER_RTT=y CONFIG_LOG_BACKEND_RTT=y CONFIG_LOG_FRONTEND_ONLY=n CONFIG_LOG_MODE_MINIMAL=n CONFIG_LOG_MODE_IMMEDIATE=y CONFIG_SERIAL=n CONFIG_UART_CONSOLE=n CONFIG_RTT_CONSOLE=y
thanks in advance for every pointer, hint etc.
Torsten
