[BUG]Onboard sdcard on teensy4.1 cannot be accessed

[nanotuxi]

Bug Description

M21 on a teensy4.1 board shows echo:No SD card 14:46:07.455 : echo:No media

My Configurations

Mostly everything is left to default. SD card is enabled.

Steps to Reproduce

1. Download fresh Marlin bugfix sources from github.
2. Configure for the teensy 4.1 board and sdcard enabled
3. Compile sources.
4. Upload with platformio.
5. Connect board via usb-cable to a linux box.
6. Open Repetierhost 2.1.6 and connect to the board.
7. In Manual Control window enter M21 to init the onboard sd-card.

Expected behavior:
M21 should init the sdcard for accessing folder and files.
M20 should list the files.

Actual behavior: [What actually happens]
The red light is turned on for about one second. SD card is not initialized.

nt_marlin_teensy4_1.zip

[nanotuxi]

@bilsef's solution/branch has been tested and is working fine. So let's wait for his pr being merged into the official branch.

[github-actions]

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