Enable MMC support in kernel

[Strayer]

I'm running Unraid on a QNAP TS-451A which includes a SD card reader. The kernel in Unraid 6.8.3 and 3.9.0-rc2 doesn't seem to include the relevant kernel configuration.

 

See for example: https://www.thinkwiki.org/wiki/How_to_get_the_internal_SD_card_working

 

The Unraid kernel config doesn't have this enabled: # CONFIG_MMC is not set

 

I'd like to use the SD card slot for a (mostly) read-only storage for Docker container configuration files and such with a high endurance SD card. Currently, SD cards aren't detected at all.

 

root@Tower:~# lspci
00:00.0 Host bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series SoC Transaction Register (rev 35)
00:02.0 VGA compatible controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller (rev 35)
00:10.0 SD Host controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series MMC Controller (rev 35)
00:13.0 SATA controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series SATA Controller (rev 35)
00:14.0 USB controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series USB xHCI Controller (rev 35)
00:1a.0 Encryption controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Trusted Execution Engine (rev 35)
00:1b.0 Audio device: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series High Definition Audio Controller (rev 35)
00:1c.0 PCI bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Express Port #1 (rev 35)
00:1c.2 PCI bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Express Port #3 (rev 35)
00:1c.3 PCI bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Express Port #4 (rev 35)
00:1f.0 ISA bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCU (rev 35)
00:1f.3 SMBus: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx SMBus Controller (rev 35)
01:00.0 SATA controller: ASMedia Technology Inc. Device 0625 (rev 01)
02:00.0 PCI bridge: ASMedia Technology Inc. Device 1182
03:03.0 PCI bridge: ASMedia Technology Inc. Device 1182
03:07.0 PCI bridge: ASMedia Technology Inc. Device 1182
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)

 

[JonathanM]

Speculation here, but I think the reason it is excluded is so that the slots don't get detected as drives and count against the license limit.

[Strayer]

4 hours ago, jonathanm said:

Speculation here, but I think the reason it is excluded is so that the slots don't get detected as drives and count against the license limit.

 

 

That does make sense, as the TS-451A does include an eMMC module that is used for installing the official QNAP firmware. That would indeed be detected as a drive when the MMC module is available. Maybe it could be built but blacklisted in a way that the user can remove the blacklist entry if they want to use it? I don't mind paying extra for the included eMMC that I wouldn't use. An empty SD slot shouldn't count towards the drive count, as far as I know Linux only shows a block device for the slot if something is in there.

Edited February 2, 2021 by Strayer
typo

[Trucking Geek]

I also would like this.  I have a pocket sized PC.  8GB Ram, 256GB eMMC, 1TB NVMe, Quad Core 2+GHz CPU.   I have a small 8GB Flash drive I use for Unraid, and have the NVMe for my storage drive.  I would like to use the 256GB eMMC drive for storage of ISO files.  ISOs take a LOT of space, but are rarely used, so having them on eMMC is not going to hurt my performance, and would be a better utilization of my available storage.

 

Unattached drives can't see the space due to lack of Kernel drivers for the eMMC.  With my setup, I am not going to be having an issue with Licensing the number of drives I have in the system.