由於回答 sam0402 兄的內容比較多，小弟還需要多一些時間。
最近 Tiny Core Linux 的樹莓派專用版 piCore64 正式推出了，有興趣的話可以比較兩者之間的分別，當然 kernel 方面就比較普通了，因此就可以感受到 Xenomai 加上 44.1KHz kernel frequency 的好處：
64-bit 的普通 5.4 kernel
http://tinycorelinux.net/12.x/aarch6...ore64-12.0.zip
32-bit 的普通 4.19 kernel
http://tinycorelinux.net/11.x/armv7l...iCore-11.0.zip
另外 Allo 亦正在開發 Compute Module 4 專用的 I/O board，暫時不知道 PCIe x1 的命運如何，假如它被內建的發燒級 USB 3.0 輸出佔用了的話就顯得比較可惜：
https://www.diyaudio.com/forums/vend...ml#post6384400沒打算購買 Compute Module 4 的話還有另一選擇：Yes we are already working on RPI4 CM
https://www.diyaudio.com/forums/digi...ml#post6382745i have an early stationpi from Ian and i can say that it definitely works on my setup. I don't have a measuring equipment. This is just based on listening with and without the stationpi. with the stationpi, the sound is by far a lot cleaner, more 3d, more alive, more dynamic. I can say that it sounds closer to analog.. I cannot go back to rpi4 without the stationpi...
this is using rpi4, ians fifopi q3 with crystec clocks then spdif to primaluna evo 100 dac..
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