SD Card error using fs_sample zephyr example code

Question

Hi I am trying to get an SD card hooked up to my nrf52840 devkit. I am using nRF Connect v2.6.1 and I was trying to get the sample code working, so I used the sample in ncs/v2.6.1/zephyr/subsys/fs/fs_sample

Unfortunately I get this error when trying to run the program

Here's a capture of what the signals look like talking to the SD card over SPI:

Oddly, the CS line is low during the initial "boot up" phase of the device; however, I thought that the CS line is supposed to be held at high voltage level during this initial boot-up? Even if it is used as active low in later communications (as defined here).

Here is my custom conf file which I've named "nrf52840dk_SDCard.conf"

#
# Copyright (c) 2023 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: Apache-2.0
#

CONFIG_NORDIC_QSPI_NOR=n
# The erase page size
CONFIG_NORDIC_QSPI_NOR_FLASH_LAYOUT_PAGE_SIZE=4096
CONFIG_DISK_DRIVERS=y
CONFIG_DISK_DRIVER_FLASH=y
# There may be no files on internal SoC flash, so this Kconfig
# options has ben enabled to create some if listing does not
# find in the first place.
CONFIG_FS_SAMPLE_CREATE_SOME_ENTRIES=y
CONFIG_DISK_ACCESS=y
CONFIG_SPI=y
CONFIG_DISK_DRIVER_SDMMC=y

Here is my board overlay file:

&spi1 {
    status = "okay";
    cs-gpios = <&gpio0 28 GPIO_ACTIVE_LOW>;
    sdhc0: sdhc@0 {
        compatible = "zephyr,sdhc-spi-slot";
        reg = <0>;
        status = "okay";
        mmc {
            compatible = "zephyr,mmc-disk";
            status = "okay";
        };
        spi-max-frequency = <25000000>;
    };
};

Here is my "prj.conf" file:

CONFIG_DISK_ACCESS=y
CONFIG_LOG=y
CONFIG_FILE_SYSTEM=y
CONFIG_FAT_FILESYSTEM_ELM=y
CONFIG_PRINTK=y
CONFIG_MAIN_STACK_SIZE=2048

# SD
CONFIG_MMC_STACK=y
CONFIG_SD_LOG_LEVEL_DEFAULT=y

CONFIG_SPI_NRFX_RAM_BUFFER_SIZE=8
CONFIG_SDHC=y
CONFIG_SDHC_LOG_LEVEL_DEFAULT=y
CONFIG_NRFX_SPI1=y

I'm not really sure what's going on here... I've tried this with 2 different SD cards as well. Is there a bug in Zephyr or am I missing something in my config...? I appreciate any help on what might be going wrong here.

Thank you,

Louis

SD Card error using fs_sample zephyr example code

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