CM1 with USB-Ethernet?

[u77345]

I have build for RP1 and it works great. Dropped it on one of the CM1s I just received, and no surprise, it did not work immediately. Beside the ethernet driver, what else needs to be rectified? Is there a USB-Ethernet adapter that work out o the box?

I tried two ethernet adapters, these were the logs. Curious how to fix the dwhci and emmc errors.

logger: Circle 47 started on Compute Module 512MB
logger: Revision code is 0011, compiler has been GCC 13.2.1
00:00:01.00 timer: SpeedFactor is 1.00
00:00:01.86 usbdev0-1: Device venb95-7720 found (HS)
00:00:01.87 usbdev0-1: Product: ASIX Elec. Corp. AX88x72A
00:00:01.92 usbdev0-1: Function is not supported
00:00:01.92 usbdev0-1: Device has no supported function
00:00:01.98 usbdev0-1: Device venb95-7720 removed
00:00:01.98 dwhci: Cannot initialize root port
00:00:01.99 emmc: Inquiry ACMD41 failed

logger: Circle 47 started on Compute Module 512MB
logger: Revision code is 0011, compiler has been GCC 13.2.1
00:00:01.00 timer: SpeedFactor is 1.00
00:00:01.86 usbdev0-1: Device ven5ac-1402 found (HS)
00:00:01.87 usbdev0-1: Product: Apple Inc.       Apple USB Ethernet Adapter
00:00:01.93 usbdev0-1: Function is not supported
00:00:01.93 usbdev0-1: Device has no supported function
00:00:01.98 usbdev0-1: Device ven5ac-1402 removed
00:00:01.99 dwhci: Cannot initialize root port
00:00:02.00 emmc: Inquiry ACMD41 failed

[rsta2]

I never tested Circle on a CM(1) by myself, I don't have one, but perhaps it can work in spite of it. First you have to add the system option USE_EMBEDDED_MMC_CM to your Config.mk file to use the eMMC memory. I only know, that this works with the CM3+ and CM4, but you could give it a try. The only known USB-Ethernet adapters to work are the Realtek RTL8152 and RTL8153. If is does not work, add the system option USE_NAK_USB_FIX. The dwhci error is triggered, because there is no supported USB device attached. That's not a serious problem.

[u77345]

Happy to report CM1 works great both with the eMMC and RTL8153 support already in Circle!

logger: Circle 50.1 started on Compute Module 512MB
logger: Revision code is 0011, compiler has been GCC 14.2.1
00:00:01.00 timer: SpeedFactor is 1.00
00:00:01.85 usbdev0-1: Device venbda-8153 found (HS)
00:00:01.86 usbdev0-1: Product: Realtek USB 10/100/1000 LAN
00:00:01.91 usbdev0-1: Interface int2-6-0 found
00:00:01.91 usbdev0-1: Using device/interface int2-6-0
00:00:01.92 ucdceth: MAC address is 00:E0:4C:68:29:70
00:00:01.92 dwroot: Device configured
00:00:06.18 dhcp: No response from server. Retrying.
00:00:06.18 dhcp: IP address is 10.0.1.83
00:00:06.70 emmc: Found a valid eMMC chip
00:00:06.71 kernel: Compile time: Mar 16 2026 22:57:05
00:00:06.71 kernel: Build variant: Compute Module (eMMC)
00:00:06.72 kernel: Filesystem: 509 MB total, 422 MB free
00:00:06.72 kernel: Open "http://10.0.1.83:8080/" in your web browser!
00:00:06.73 kernel: Try "tftp -m binary 10.0.1.83 -c put kernel.img" from another computer!
00:00:06.74 kernel: Boot sources: HTTP, TFTP, GPIO17 button, 60s auto-boot

[rsta2]

Great to hear that! Thanks for info.