FML13V03 (DC-ROMA Mainboard II): eMMC does not enumerate in Linux (only SD mmc0 present)

[Shalasere]

Board: DeepComputing DC-ROMA RISC-V Mainboard II — FML13V03
Boot: microSD 32G (known-good); eMMC module installed on board (recommended for Mainboard I): https://www.amazon.com/dp/B0C9GRHRT1?th=1
Use case: Hobbyist/dev, trying to install the OS to eMMC
All images grabbed from the JFrog / Atisfactory url provided in documentation: http://120.92.155.32:8082/ui/native/virtOS/fml13v03-eswin/

What I tested (Deb14 and Ubuntu24.04 )

A) Debian “deb14” build 15307 (SD boot)

$ uname -r
6.6.92-eic7x-2025.07

$ zgrep CONFIG_MMC_SDHCI_OF_DWCMSHC /proc/config.gz || echo "no config.gz"
# CONFIG_MMC_SDHCI_OF_DWCMSHC is not set

$ ls /sys/class/mmc_host
mmc0

$ lsblk -e7 -o NAME,SIZE,TYPE
NAME         SIZE TYPE
ram0          32M disk
ram1          32M disk
mmcblk0     29.1G disk
├─mmcblk0p1  200M part
├─mmcblk0p2    2G part
└─mmcblk0p3 26.9G part
nvme0n1     13.4G disk

B) Ubuntu 15019 (SD boot) previously used on this board
Kernel: 6.6.92-eic7x-2025.07. DT status seen from the running system:

$ grep -R -i -E 'status$' /proc/device-tree/soc/mmc@* | sed -n '1,20p'
/proc/device-tree/soc/mmc@0x50460000
okay
/proc/device-tree/soc/mmc@0x50470000
disabled
/proc/device-tree/soc/mmc@0x70460000
disabled
/proc/device-tree/soc/mmc@0x70470000
disabled
/proc/device-tree/soc/mmc@50450000
disabled
/proc/device-tree/soc/mmc@70450000
disabled

On the Ubuntu boot, additional MMC nodes in the DT appear with status = "disabled" (see snippet above).

Observed behavior

In both cases, only mmc0 (SD) is present.

There is no mmc1 host and no /dev/mmcblk1 block device to target the eMMC.

On my Debian 15307 boot, kernel config shows:

# CONFIG_MMC_SDHCI_OF_DWCMSHC is not set

Expected behavior

eMMC host enumerates (e.g., /sys/class/mmc_host/mmc1) and a block device appears (e.g., /dev/mmcblk1) so the OS can be installed to eMMC.

Request

Is eMMC enumeration on FML13V03 expected to work with current images/kernels?

If yes, which image/kernel/DTB version should include it?

If not yet supported on this board/rev, is there a tracking build or branch to try?

Additional data available on request

Full dmesg (Debian 15307)

/proc/device-tree dump

lsmod, zcat /proc/config.gz

UART boot log

Formatted with Ollama (local) for formatting/clarity only.

[DC-DeepComputing]

Board: DeepComputing DC-ROMA RISC-V Mainboard II — FML13V03 Boot: microSD 32G (known-good); eMMC module installed on board (recommended for Mainboard I): https://www.amazon.com/dp/B0C9GRHRT1?th=1 Use case: Hobbyist/dev, trying to install the OS to eMMC All images grabbed from the JFrog / Atisfactory url provided in documentation: http://120.92.155.32:8082/ui/native/virtOS/fml13v03-eswin/

What I tested (Deb14 and Ubuntu24.04 )

A) Debian “deb14” build 15307 (SD boot)

$ uname -r
6.6.92-eic7x-2025.07

$ zgrep CONFIG_MMC_SDHCI_OF_DWCMSHC /proc/config.gz || echo "no config.gz"
# CONFIG_MMC_SDHCI_OF_DWCMSHC is not set

$ ls /sys/class/mmc_host
mmc0

$ lsblk -e7 -o NAME,SIZE,TYPE
NAME         SIZE TYPE
ram0          32M disk
ram1          32M disk
mmcblk0     29.1G disk
├─mmcblk0p1  200M part
├─mmcblk0p2    2G part
└─mmcblk0p3 26.9G part
nvme0n1     13.4G disk

B) Ubuntu 15019 (SD boot) previously used on this board Kernel: 6.6.92-eic7x-2025.07. DT status seen from the running system:

$ grep -R -i -E 'status$' /proc/device-tree/soc/mmc@* | sed -n '1,20p'
/proc/device-tree/soc/mmc@0x50460000
okay
/proc/device-tree/soc/mmc@0x50470000
disabled
/proc/device-tree/soc/mmc@0x70460000
disabled
/proc/device-tree/soc/mmc@0x70470000
disabled
/proc/device-tree/soc/mmc@50450000
disabled
/proc/device-tree/soc/mmc@70450000
disabled

On the Ubuntu boot, additional MMC nodes in the DT appear with status = "disabled" (see snippet above).

Observed behavior

In both cases, only mmc0 (SD) is present.

There is no mmc1 host and no /dev/mmcblk1 block device to target the eMMC.

On my Debian 15307 boot, kernel config shows:

# CONFIG_MMC_SDHCI_OF_DWCMSHC is not set

Expected behavior

eMMC host enumerates (e.g., /sys/class/mmc_host/mmc1) and a block device appears (e.g., /dev/mmcblk1) so the OS can be installed to eMMC.

Request

Is eMMC enumeration on FML13V03 expected to work with current images/kernels?

If yes, which image/kernel/DTB version should include it?

If not yet supported on this board/rev, is there a tracking build or branch to try?

Additional data available on request

Full dmesg (Debian 15307)

/proc/device-tree dump

lsmod, zcat /proc/config.gz

UART boot log

Formatted with Ollama (local) for formatting/clarity only.

You can check whether your eMMC model is supported by the motherboard; currently, it is known to support these two specific eMMC models.

[Shalasere]

The linked emmc module I presented is the 256g module from Orange Pi.

I can purchase a 64g and attempt the presented steps again. I would expect the 256g module to be supported as it presents an ideal main-memory source leaving the nvme slot open.

I'm also surprised that there aren't any commands that present the emmc module slot as "enabled" even if not populated (or populated by an unsupported module)

[DC-DeepComputing]

The linked emmc module I presented is the 256g module from Orange Pi.

I can purchase a 64g and attempt the presented steps again. I would expect the 256g module to be supported as it presents an ideal main-memory source leaving the nvme slot open.

I'm also surprised that there aren't any commands that present the emmc module slot as "enabled" even if not populated (or populated by an unsupported module)

The eMMC you're using is supported—could it be that the eMMC and device aren't properly connected, causing it to be undetected?

You might check the motherboard's U-Boot environment: mmc0 appears multiple times in the environment logs:

arch=riscv
baudrate=115200
board=FML13V03
board_name=FML13V03
boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr} ${prefix}${script}; source ${scriptaddr}
boot_conf_addr_r=0xc0000000
boot_conf_file=/extlinux/extlinux.conf
boot_efi_binary=setenv stdout serial,vidconsole;cls;load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} efi/boot/bootriscv64.efi; if fdt addr -q ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r};else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi
boot_efi_bootmgr=if fdt addr -q ${fdt_addr_r}; then bootefi bootmgr ${fdt_addr_r};else bootefi bootmgr;fi
boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} ${prefix}${boot_syslinux_conf}
boot_net_usb_start=usb start
boot_pci_enum=pci enum
boot_prefixes=/ /boot/
boot_script_dhcp=boot.scr.uimg
boot_scripts=boot.scr.uimg boot.scr
boot_syslinux_conf=extlinux/extlinux.conf
boot_targets=usb mmc1 mmc0 nvme
boot_updatedelay=10
bootargs= cpu_no_boost_1_6ghz
bootcmd=run fdt_cmd;run fdt_cmd;if env exists updated; then exit;fi;bootflow scan -b;setenv stdout serial,vidconsole;cls;echo No boot medium found!;
bootcmd_dhcp=devtype=dhcp; run boot_net_usb_start; run boot_pci_enum; if dhcp ${scriptaddr} ${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile ${fdtfile}; setenv efi_old_vci ${bootp_vci};setenv efi_old_arch ${bootp_arch};setenv bootp_vci PXEClient:Arch:00027:UNDI:003000;setenv bootp_arch 0x1b;if dhcp ${kernel_addr_r}; then tftpboot ${fdt_addr_r} dtb/${efi_fdtfile};if fdt addr -q ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r}; else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi;fi;setenv bootp_vci ${efi_old_vci};setenv bootp_arch ${efi_old_arch};setenv efi_fdtfile;setenv efi_old_arch;setenv efi_old_vci;
bootcmd_mmc0=devnum=0; run mmc_boot
bootdelay=0
cpu=eic770x
distro_bootcmd=setenv nvme_need_init; for target in ${boot_targets}; do run bootcmd_${target}; done
efi_dtb_prefixes=/ /dtb/ /dtb/current/
emmc_dev=0
fdt_addr=edcf9050
fdt_addr_r=0x88000000
fdt_cmd=fdt mmz mmz_nid_0_part_0 0x1c0000000 0x2c0000000
fdt_high=0xffffffffffffffff
fdtaddr=edcf9050
fdtcontroladdr=edcf9050
fdtfile=eswin/eic7702-deepcomputing-fml13v03.dtb
gpt_partition=gpt write mmc ${emmc_dev} $partitions
initrd_high=0xffffffffffffffff
kernel_addr_r=0x84000000
kernel_comp_addr_r=0x98300000
kernel_comp_size=0x10000000
load_efi_dtb=load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} ${prefix}${efi_fdtfile}
loadaddr=0x80200000
mmc_boot=if mmc dev ${devnum}; then devtype=mmc; run scan_dev_for_boot_part; fi
nvme_boot=run boot_pci_enum; run nvme_init; if nvme dev ${devnum}; then devtype=nvme; run scan_dev_for_boot_part; fi
nvme_init=if ${nvme_need_init}; then setenv nvme_need_init false; nvme scan; fi
partitions=name=boot,start=1MiB,size=512MiB,type=${typeid_efi},uuid=${uuid_boot};name=swap,size=4096MiB,type=${typeid_swap},uuid=${uuid_swap};name=root,size=-,type=${typeid_filesystem},uuid=${uuid_root}
preboot=setenv fdt_addr ${fdtcontroladdr};fdt addr ${fdtcontroladdr};boardinfo_print;usb start;sata init;nvme scan
pxefile_addr_r=0x88200000
ramdisk_addr_r=0x88300000
sata_boot=if sata dev ${devnum}; then devtype=sata; run scan_dev_for_boot_part; fi
scan_dev_for_boot=echo Scanning ${devtype} ${devnum}:${distro_bootpart}...; for prefix in ${boot_prefixes}; do run scan_dev_for_extlinux; run scan_dev_for_scripts; done;run scan_dev_for_efi;
scan_dev_for_boot_part=part list ${devtype} ${devnum} -bootable devplist; env exists devplist || setenv devplist 1; for distro_bootpart in ${devplist}; do if fstype ${devtype} ${devnum}:${distro_bootpart} bootfstype; then part uuid ${devtype} ${devnum}:${distro_bootpart} distro_bootpart_uuid ; run scan_dev_for_boot; fi; done; setenv devplist
scan_dev_for_efi=setenv efi_fdtfile ${fdtfile}; for prefix in ${efi_dtb_prefixes}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${efi_fdtfile}; then run load_efi_dtb; fi;done;run boot_efi_bootmgr;if test -e ${devtype} ${devnum}:${distro_bootpart} efi/boot/bootriscv64.efi; then echo Found EFI removable media binary efi/boot/bootriscv64.efi; run boot_efi_binary; echo EFI LOAD FAILED: continuing...; fi; setenv efi_fdtfile
scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${boot_syslinux_conf}; then echo Found ${prefix}${boot_syslinux_conf}; run boot_extlinux; echo EXTLINUX FAILED: continuing...; fi
scan_dev_for_scripts=for script in ${boot_scripts}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${script}; then echo Found U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT FAILED: continuing...; fi; done
scriptaddr=0x88100000
sdupdate=ext4load mmc 1:1 0x90000000 sdupdate.scr;source 0x90000000
splashimage=0xe0000000
splashpos=0,0
stderr=vidconsole,serial
stdin=serial,usbkbd
stdout=serial
typeid_efi=C12A7328-F81F-11D2-BA4B-00A0C93EC93B
typeid_filesystem=0FC63DAF-8483-4772-8E79-3D69D8477DE4
typeid_swap=0657FD6D-A4AB-43C4-84E5-0933C84B4F4F
usb_boot=usb start; if usb dev ${devnum}; then devtype=usb; run scan_dev_for_boot_part; fi
usbupdate=if ext4load usb 0 0x90000000 usbupdate.scr; then echo run usbupdate.scr...;source 0x90000000;exit;fi;
uuid_boot=44b7cb94-f58c-4ba6-bfa4-7d2dce09a3a5
uuid_root=80a5a8e9-c744-491a-93c1-4f4194fd690a
uuid_swap=5ebcaaf0-e098-43b9-beef-1f8deedd135e
vendor=eswin

Environment size: 5340/524284 bytes

[Shalasere]

Let me preface this with I'm in no way comfortable or used to Uboot that said, here are my logs and discovery from accessing via uart.

My version and Uboot vars

=> version
U-Boot 2024.01 (Oct 13 2025 - 03:38:17 +0000)

riscv64-unknown-linux-gnu-gcc () 13.2.0
GNU ld (GNU Binutils) 2.42
=> 

=> printenv
arch=riscv
baudrate=115200
board=FML13V03
board_name=FML13V03
boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr} ${prefix}${script}; source ${scriptaddr}
boot_conf_addr_r=0xc0000000
boot_conf_file=/extlinux/extlinux.conf
boot_efi_binary=setenv stdout serial,vidconsole;cls;load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} efi/boot/bootriscv64.efi; if fdt addr -q ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r};else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi
boot_efi_bootmgr=if fdt addr -q ${fdt_addr_r}; then bootefi bootmgr ${fdt_addr_r};else bootefi bootmgr;fi
boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} ${prefix}${boot_syslinux_conf}
boot_net_usb_start=usb start
boot_pci_enum=pci enum
boot_prefixes=/ /boot/
boot_script_dhcp=boot.scr.uimg
boot_scripts=boot.scr.uimg boot.scr
boot_syslinux_conf=extlinux/extlinux.conf
boot_targets=usb mmc1 mmc0 nvme
boot_updatedelay=10
bootargs= cpu_no_boost_1_6ghz
bootcmd=if env exists updated; then exit;fi;bootflow scan -b;setenv stdout serial,vidconsole;cls;echo No boot medium found!;
bootcmd_dhcp=devtype=dhcp; run boot_net_usb_start; run boot_pci_enum; if dhcp ${scriptaddr} ${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile ${fdtfile}; setenv efi_old_vci ${bootp_vci};setenv efi_old_arch ${bootp_arch};setenv bootp_vci PXEClient:Arch:00027:UNDI:003000;setenv bootp_arch 0x1b;if dhcp ${kernel_addr_r}; then tftpboot ${fdt_addr_r} dtb/${efi_fdtfile};if fdt addr -q ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r}; else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi;fi;setenv bootp_vci ${efi_old_vci};setenv bootp_arch ${efi_old_arch};setenv efi_fdtfile;setenv efi_old_arch;setenv efi_old_vci;
bootcmd_mmc0=devnum=0; run mmc_boot
bootdelay=0
cpu=eic770x
distro_bootcmd=setenv nvme_need_init; for target in ${boot_targets}; do run bootcmd_${target}; done
efi_dtb_prefixes=/ /dtb/ /dtb/current/
emmc_dev=0
fdt_addr=edcf9050
fdt_addr_r=0x88000000
fdt_high=0xffffffffffffffff
fdtaddr=edcf9050
fdtcontroladdr=edcf9050
fdtfile=eswin/eic7702-deepcomputing-fml13v03.dtb
gpt_partition=gpt write mmc ${emmc_dev} $partitions
initrd_high=0xffffffffffffffff
kernel_addr_r=0x84000000
kernel_comp_addr_r=0x98300000
kernel_comp_size=0x10000000
load_efi_dtb=load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} ${prefix}${efi_fdtfile}
loadaddr=0x80200000
mmc_boot=if mmc dev ${devnum}; then devtype=mmc; run scan_dev_for_boot_part; fi
nvme_boot=run boot_pci_enum; run nvme_init; if nvme dev ${devnum}; then devtype=nvme; run scan_dev_for_boot_part; fi
nvme_init=if ${nvme_need_init}; then setenv nvme_need_init false; nvme scan; fi
partitions=name=boot,start=1MiB,size=512MiB,type=${typeid_efi},uuid=${uuid_boot};name=swap,size=4096MiB,type=${typeid_swap},uuid=${uuid_swap};name=root,size=-,type=${typeid_filesystem},uuid=${uuid_root}
preboot=setenv fdt_addr ${fdtcontroladdr};fdt addr ${fdtcontroladdr};boardinfo_print;usb start;sata init;nvme scan
pxefile_addr_r=0x88200000
ramdisk_addr_r=0x88300000
sata_boot=if sata dev ${devnum}; then devtype=sata; run scan_dev_for_boot_part; fi
scan_dev_for_boot=echo Scanning ${devtype} ${devnum}:${distro_bootpart}...; for prefix in ${boot_prefixes}; do run scan_dev_for_extlinux; run scan_dev_for_scripts; done;run scan_dev_for_efi;
scan_dev_for_boot_part=part list ${devtype} ${devnum} -bootable devplist; env exists devplist || setenv devplist 1; for distro_bootpart in ${devplist}; do if fstype ${devtype} ${devnum}:${distro_bootpart} bootfstype; then part uuid ${devtype} ${devnum}:${distro_bootpart} distro_bootpart_uuid ; run scan_dev_for_boot; fi; done; setenv devplist
scan_dev_for_efi=setenv efi_fdtfile ${fdtfile}; for prefix in ${efi_dtb_prefixes}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${efi_fdtfile}; then run load_efi_dtb; fi;done;run boot_efi_bootmgr;if test -e ${devtype} ${devnum}:${distro_bootpart} efi/boot/bootriscv64.efi; then echo Found EFI removable media binary efi/boot/bootriscv64.efi; run boot_efi_binary; echo EFI LOAD FAILED: continuing...; fi; setenv efi_fdtfile
scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${boot_syslinux_conf}; then echo Found ${prefix}${boot_syslinux_conf}; run boot_extlinux; echo EXTLINUX FAILED: continuing...; fi
scan_dev_for_scripts=for script in ${boot_scripts}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${script}; then echo Found U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT FAILED: continuing...; fi; done
scriptaddr=0x88100000
sdupdate=ext4load mmc 1:1 0x90000000 sdupdate.scr;source 0x90000000
splashimage=0xe0000000
splashpos=0,0
stderr=vidconsole,serial
stdin=serial,usbkbd
stdout=vidconsole,serial
typeid_efi=C12A7328-F81F-11D2-BA4B-00A0C93EC93B
typeid_filesystem=0FC63DAF-8483-4772-8E79-3D69D8477DE4
typeid_swap=0657FD6D-A4AB-43C4-84E5-0933C84B4F4F
usb_boot=usb start; if usb dev ${devnum}; then devtype=usb; run scan_dev_for_boot_part; fi
usbupdate=if ext4load usb 0 0x90000000 usbupdate.scr; then echo run usbupdate.scr...;source 0x90000000;exit;fi;
uuid_boot=44b7cb94-f58c-4ba6-bfa4-7d2dce09a3a5
uuid_root=80a5a8e9-c744-491a-93c1-4f4194fd690a
uuid_swap=5ebcaaf0-e098-43b9-beef-1f8deedd135e
vendor=eswin

Environment size: 5270/524284 bytes
=>

Digging into mmc

=> mmc list
sdhci@50450000: 0 (eMMC)
sd@50460000: 1 (SD)

=> mmc dev 0
switch to partitions #0, OK
mmc0(part 0) is current device

=> mmc info
Device: sdhci@50450000
Manufacturer ID: d6
OEM: 3
Name: A3V014
Bus Speed: 200000000
Mode: HS400 (200MHz)
Rd Block Len: 512
MMC version 5.1
High Capacity: Yes
Capacity: 233 GiB
Bus Width: 8-bit DDR
Erase Group Size: 512 KiB
HC WP Group Size: 8 MiB
User Capacity: 233 GiB WRREL
Boot Capacity: 4 MiB ENH
RPMB Capacity: 16 MiB ENH
Boot area 0 is not write protected
Boot area 1 is not write protected

Attempting to create a GPT on the eMMC

=> mmc part
## Unknown partition table type 0

=> gpt write mmc 0 $partitions
Writing GPT: mmc write failed
error!

=> mmc part
## Unknown partition table type 0

Finally, noting that I cannot access/see the SD card info in Uboot

=> mmc dev 1
fs/fs_internal.c:77-          fs_devread()  ** fs_devread read error - block
lib/efi_loader/efi_disk.c:633-efi_disk_create_part() Adding partition for sd@50460000.blk:1 failed
drivers/mmc/mmc.c:1891-sd_select_mode_and_width() unable to select a mode
switch to partitions #0, ERROR

I've also attached a full boot log going from linux -> Uboot (hanging and having to unplug power to reboot into Uboot) -> selecting "1" to boot to the deb14 image -> back to linux login (ls mmc to show the eMMC is not revealed in linux)

fullboot.log

[Shalasere]

Ok, I've gotten it but dang was it messy. TIL: what device trees are. Below is a step by step that I've not tried on any other images or dtb's, however, it did get it to work on my device.

The Device Tree entry for the eMMC on my machine:

 mmc@50450000 {
3819-                   compatible = "eswin,emmc-sdhci-5.1";
3820-                   reg = <0x00 0x50450000 0x00 0x10000>;
3821-                   interrupt-parent = <0x22>;
3822-                   interrupts = <0x4f>;
3823-                   assigned-clocks = <0x03 0x22a>;
3824-                   assigned-clock-rates = <0xbebc200>;
3825-                   clocks = <0x03 0x22a 0x03 0x222 0x03 0x221 0x03 0x222>;
3826-                   clock-names = "clk_xin", "clk_ahb", "aclk", "cfg_clk";
3827-                   clock-output-names = "emmc_cardclock";
3828-                   #clock-cells = <0x00>;
3829-                   resets = <0x24 0x07 0x40 0x24 0x07 0x08 0x24 0x07 0x80000 0x24 0x07 0x800000>;
3830-                   reset-names = "txrx_rst", "phy_rst", "prstn", "arstn";
3831-                   disable-cqe-dcmd;
3832-                   bus-width = <0x08>;
3833-                   non-removable;
3834-                   mmc-hs400-1_8v;
3835-                   max-frequency = <0xbebc200>;
3836-                   #size-cells = <0x02>;
3837-                   iommus = <0x29 0x0f>;
3838-                   tbus = <0x02>;
3839-                   dma-ranges = <0x00 0x00 0x00 0xc0000000 0x01 0x00>;
3840-                   eswin,hsp_sp_csr = <0x2b 0x1038 0x508 0x50c>;
3841-                   eswin,syscrg_csr = <0x25 0x160 0x148 0x14c>;
3842-                   status = "okay";
3843-                   numa-node-id = <0x00>;
3844-                   dma-noncoherent;
3845-                   delay_code = <0x17>;
3846-                   drive-impedance-ohm = <0x32>;
3847-                   enable-cmd-pullup;
3848-                   enable-data-pullup;
3849-                   no-sdio;
3850-                   no-sd;
3851-           };

Below are the steps I took to modify line 3842 from the previous "disabled" to "okay" to enable it.

# 0) backup factory Device Tree Blob (dtb)
DTB=/boot/dtbs/6.6.92-eic7x-2025.07/eswin/eic7702-deepcomputing-fml13v03.dtb
# 0.5) timestamp factory backup
sudo cp -a "$DTB" "${DTB%.dtb}.orig.$(date +%F-%H%M).dtb"

# 1) Decompile to Device Tree Source (dts)
dtc -I dtb -O dts -o ~/fml13v03.dts "$DTB"

# 1.5) Find your eMMC device tree entry and validate "status" is disabled.
grep -nA200 -B5 '@50450000' ~/fml13v03.dts | less

# flip just this node:
#   mmc@50450000 { ... status = "disabled"; ... }
# to:
#   mmc@50450000 { ... status = "okay"; ... }

# perl magic I found online it changes the status line *does not force it*
perl -0777 -pe 's/((?:mmc|sdhci)\@50450000\s*\{[^}]*?)status\s*=\s*"(?:disabled|okay)";/$1status = "okay";/s' -i ~/fml13v03.dts

# 2) Recompile and overwrite the file U-Boot loads
dtc -I dts -O dtb -o ~/fml13v03-emmc.dtb ~/fml13v03.dts
sudo cp ~/fml13v03-emmc.dtb "$DTB"

# 3) Reboot
sudo reboot

also, when plugged into the uart, it seems that the device will reboot into uboot and one must hard power off the device (unplug) and replug to get uboot to see a bootable medium (sd card in my case) and boot successfully up to a linux shell.

[Shalasere]

Hi there folks,

I'm following up to request the modification to the device tree demonstrated get integrated into the factory supplied images. I'm happy to test any images modified and am very interested in getting this working.

[hfvogt]

There is actually a much easier way to modify dtbs: use fdtget/fdtput (in Debian part of the device-tree-compiler deb).
In this case the command would be as easy as:

sudo fdtput -t s /boot/dtbs/6.6.92-eic7x-2025.07/eswin/eic7702-deepcomputing-fml13v03.dtb /soc/mmc@50450000 status "okay"