Hi,
I received my Turing Pi 2 a couple of weeks ago. Waited for a mini ITX case to arrive (already hoarded CM4 modules) and it works great.
First I installed Ubuntu 22.10 on each of my 4 CM4s and this worked. But then I said to myself: why not use this opportunity to learn NixOS better? So I switched to NixOS.
The CM4s I use are 2x 4 GB RAM 8 GB eMMC no WLAN and 2x 4 GB RAM 32 GB eMMC. I’m booting from eMMC.
I’ve tried with a recent Hydra AArch64 image as well as cross-compiling my own image using Qemu on x86-64. The images work perfectly well on every CM4, except for whichever CM4 is in slot #3. So if I swap them around, they always work well in slots #1 #2 and #4 but not in #3 (Ubuntu 22.10 works here).
There’s nothing useful in UART. I mean, all I see is uboot (normally it gets further and I see the OS booting up). It doesn’t get further. So I’ve been wondering, what could it be? It seems to be a boot loop (snippet @ [1]). Looking at Specs and I/O Ports what stands out is the third module has two SATA ports. But none of these are connected, and the UUID defined by NixOS configuration is unique.
[1] U-Boot 2022.10 (Oct 03 2022 - 19:25:32 +0000)\r\n\r\nDRAM: 3.9 GiB\r\nRPI Compute Module 4 (0xc03141)\r\nCore: 209 devices, 16 uclasses, devicetree: board\r\nMMC: mmcnr@7e300000: 1, mmc@7e340000: 0\r\nLoading Environment from FAT… Unable to read "uboot.env" from mmc0:1… \r\nIn: serial\r\nOut: serial\r\nErr: serial\r\nNet: eth0: ethernet@7d580000\r\nPCIe BRCM: link up, 5.0 Gbps x1 (SSC)\r\n"Error" handler, esr 0xbf000002\r\nelr: 00000000000b107c lr : 00000000000b1020 (reloc)\r\nelr: 000000003b37e07c lr : 000000003b37e020\r\nx0 : 000000000000dead x1 : 00000000fd508000\r\nx2 : 00000000fd508000 x3 : 0000000000000000\r\nx4 : 000000003af3b2d0 x5 : 0000000000000001\r\nx6 : 000000003b37f984 x7 : 0000000000000002\r\nx8 : 000000003b37fa60 x9 : 0000000000000008\r\nx10: 0000000000008a98 x11: 000000003af3b20c\r\nx12: 0000000000000140 x13: 000000003af3b1f8\r\nx14: 000000003af3b890 x15: 0000000000000020\r\nx16: 000000003b37fa60 x17: 0000000000000000\r\nx18: 000000003af48d70 x19: 000000003af3b2d0\r\nx20: 0000000000000001 x21: 000000003b3d4f78\r\nx22: 0000000000000000 x23: 000000003b3d5ad8\r\nx24: 000000003b3e4e84 x25: 0000000000000000\r\nx26: 0000000000010000 x27: 000000003b3cc000\r\nx28: 000000003af53600 x29: 000000003af3b220\r\n\r\nCode: 17fffff1 f94017e0 79400000 12003c00 (d5033fbf) \r\nResetting CPU …\r\n\r\nresetting …\r\n\r\n\r\n