cannot boot SD card : "unable to select a mode"

I have U-Boot installed on SPI and Gentoo Linux running on eMMC.
I would like to be able to boot from SD card for maintenance purposes.

The boot order is this by default :
altbootcmd=setenv boot_syslinux_conf extlinux/extlinux-rollback.conf;run distro_bootcmd
boot_scripts=boot.scr.uimg boot.scrboot_syslinux_conf=extlinux/extlinux.conf
boot_targets=mmc1 mmc0 nvme0 usb0 pxe dhcp sf0
bootcmd=run distro_bootcmd
distro_bootcmd=setenv nvme_need_init; for target in ${boot_targets}; do run bootcmd_${target}; done

So it should be: sd card, eMMC, nvme, usb, pxe, ...

but when I boot, U-Boot try to initilize the SD card and fails "unable to select a mode", then continues to eMMC:
The system is going down for reboot NOW!
pbp ~ #
U-Boot TPL 2020.07-pcm720-00007-g132da38490 (Jul 20 2020 - 20:40:04)
Channel 0: LPDDR4, 50MHz
BW=32 Col=10 Bk=8 CS0 Row=15 CS1 Row=15 CS=2 Die BW=16 Size=2048MB
Channel 1: LPDDR4, 50MHz
BW=32 Col=10 Bk=8 CS0 Row=15 CS1 Row=15 CS=2 Die BW=16 Size=2048MB
256B stride
256B stride
lpddr4_set_rate: change freq to 400000000 mhz 0, 1
lpddr4_set_rate: change freq to 800000000 mhz 1, 0
Trying to boot from BOOTROM
Returning to boot ROM...

U-Boot SPL 2020.07-pcm720-00007-g132da38490 (Jul 20 2020 - 20:40:04 +0300)
Trying to boot from SPI
NOTICE:  BL31: v2.3(release):v2.3-353-gae72c4d5e
NOTICE:  BL31: Built : 20:39:57, Jul 20 2020

U-Boot 2020.07-pcm720-00007-g132da38490 (Jul 20 2020 - 20:40:04 +0300)

SoC: Rockchip rk3399
Reset cause: RST
Model: Pine64 Pinebook Pro
DRAM:  3.9 GiB
PMIC:  RK808
MMC:  mmc@fe310000: 2, mmc@fe320000: 1, sdhci@fe330000: 0
In:    serial
Out:  serial
Err:  serial
Model: Pine64 Pinebook Pro
Net:  No ethernet found.
Hit any key to stop autoboot:  0
unable to select a mode
switch to partitions #0, OK
mmc0(part 0) is current device
Scanning mmc 0:1...
Found U-Boot script /boot/boot.scr
651 bytes read in 18 ms (35.2 KiB/s)
## Executing script at 00500000
Boot script loaded from mmc 0
25088512 bytes read in 1104 ms (21.7 MiB/s)
61463 bytes read in 22 ms (2.7 MiB/s)
## Flattened Device Tree blob at 01f00000
  Booting using the fdt blob at 0x1f00000
  Loading Device Tree to 00000000f4e8c000, end 00000000f4f03fff ... OK

Starting kernel ...

pbp login:

I've tried many different OS : manjaro, dietpi, and same result:
=> mmc dev 1
unable to select a mode

==== unplug SD card ; replug it

=> mmc dev 1                 
switch to partitions #0, OK
mmc1 is current device
=> mmc part

Partition Map for MMC device 1  --  Partition Type: DOS

Part Start Sector Num Sectors UUID Type
** Can't read partition table on 1:0 **

but Linux can read the SD card and the contents. The partition table is MBR, boot partition 1 is in FAT or EXT2 and marked as active.

I will try an other SD card...

SOLVED: I change the SD card and now it boots first on it, then the eMMC.
Kind regards,
Xavier Miller.

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