piCorePlayer6.1.0-Xenomai-44.1-48KHz雙機入門簡易安裝教學

[seeteeyou]

Kernel 5.4.72 的 ipipe-arm64 和 5.4.93 的 ipipe-arm 來了，終於步入 beta 測試階段：

https://xenomai.org/downloads/ipipe/...-arm64-0.patch
https://gitlab.denx.de/Xenomai/ipipe...5.4.72-arm64-0
https://gitlab.denx.de/Xenomai/ipipe...ts/ipipe/5.4.y

https://xenomai.org/downloads/ipipe/...93-arm-0.patch
https://gitlab.denx.de/Xenomai/ipipe...e-5.4.93-arm-0
https://gitlab.denx.de/Xenomai/ipipe...ts/ipipe/5.4.y

---

這個 psp 看來相當好用：

psp

Introducing an advanced ps (process state) command and a new alias. The vastly stripped down default pCP "ps" Linux command (busybox) is pretty useless when it comes to looking up your process situation.

Now. The pCP toolbox installs a small package (procps-ng) that offers the full featured ps. The toolbox installer installs also a very useful alias that runs ps with some useful options.

By typing psp in a terminal, you'll get the full picture, about processes, threads, priorities and affinities. This way you can easily verify if all related settings and tweaks are working.

It's actually been me who just recently talked pCP-Paul into getting the procps-np package into the pCP repo (Thx Paul for acting so quick). Background: There's been a recent discussion over at squeezebox forums where certain flaws remained undiscovered because of the lack of such a tool. (I hope the pCP team can make this - my setup - default).



What you can see here is, is that a squeezelite-custom version runs @priority 47. And just the output thread runs @prio48. You also see that all threads except the output thread (CPU3) are attached to CPU2. That's basically how it looks if everything is properly pCP-Toolbox-like configured.

You can try this command once you're done with the whole setup and tweaking.

Introducing the pCP Toolbox (Beta)
https://soundcheck-audio.blogspot.co...lbox-beta.html

The piCorePlayer Toolbox (Beta)
https://soundcheck-audio.blogspot.co...p-toolbox.html

soundcheck's piCorePlayer Toolbox 1.0
https://github.com/klslz/pcptoolbox

---

RPi4 和 pCP 變得更強大了。

[seeteeyou]

這是 soundcheck 兄最新的 repo：

soundcheck's tuning kit - pCP 1.0 (Beta)
https://github.com/klslz/tuningkitpcp

Works great on a AlloBridge with a Rpi 3CM module.
I did have to extend file system to 500Mb, but after that smooth install and great sound.
Thanks!

另外 LMS 用的 Material Skin 亦更新了：

https://github.com/CDrummond/lms-mat...ases/tag/2.2.3
https://github.com/CDrummond/lms-mat...rial-2.2.3.zip

Android 的 LMS Material app：

https://f-droid.org/en/packages/com....smaterial.app/
https://f-droid.org/repo/com.craigd....al.app_104.apk
https://github.com/CDrummond/lms-mat...ease-0.1.4.apk

---

https://www.my-hiend.com/vbb/showthr...263#post243263

再分享小弟的另外的經驗，自小弟發表的Lite至Noël版的過程中，加上常跑「新天新地」，發現訊源越正確，可以省下大電功或多顆電容的錢。
我常常在更新版本後發現的新聲音，Box卻可以用多加電容或大電功把藍光機擠出聲音來。
所以小弟也就可以不用投資那麼多電容和空間了。

http://www.stsd99.com/phpBB3/viewtop...p=19465#p19465

自Noël版本出線後，小弟發現訊源夠強，可以省電供！
在不斷的版本更新升級，樂器的真實感越來越好，動態也越來越高。
至Noël V3，小弟曾試過大瓦數電供，狀況並沒有比小弟現役的Daitron LFS150(100W)好。

看來 EVL 比 Xenomai 更勝一籌，也許前者比後者更加不需要 1500W 的 Cosel 了，畢竟盡量優化／精簡 Kernel 的好處就是降低了大瓦數電供的重要性吧：

https://evlproject.org/core/

[sam0402]

看來 EVL 比 Xenomai 更勝一籌，也許前者比後者更加不需要 1500W 的 Cosel 了，畢竟盡量優化／精簡 Kernel 的好處就是降低了大瓦數電供的重要性吧：

https://evlproject.org/core/

感謝Seeteeyou兄又提供新資訊。

EVL好像很厲害，我應該會拿pCP7 來試試看吧！
希望過年時有空處理。

[sam0402]

Noël V4 更新　更完備的版本

請由此進
http://www.stsd99.com/phpBB3/viewtop...54507ef#p19506

[tetsuka]

小弟也在本討論串首頁追加了sam兄新編譯的Noel V4的img檔了。
有在使用sam兄編譯的piCorePlayer的網兄請務必更換為新的Noel V4試試看。
Noel V4版的高低音頻寬都更加的延伸且聲音也更加的自然和流暢。
小弟在提供Noel V4給日本音響BLOG主測試後，他聽不到半小時就發文強烈建議BLOG的所有讀者都更換為Noel V4了。

[seeteeyou]

後記：
小弟還有個秘密武器，可以讓樹莓派提升不少音質...

不知道那是軟件還是硬件呢？假如是後者的話，小弟猜測它也許跟 DigiPi 有一些關係：

樹莓派改裝
https://item.taobao.com/item.htm?id=614180521171

查克拉 Chakra 低噪聲直流再生電源
https://item.taobao.com/item.htm?id=614978286977

hifi交換機
https://item.taobao.com/item.htm?id=618190172689

[chgeorge]

chgeorge兄您好

有沒有可能是您在Squeezelite的ALSA setting中指定了24bit輸出?
附件 33531
ALSA setting的第三個參數是用來指定聲音取樣數的，保持為空白會依訊源取樣數自動切換。

或是你也可以找一台PC安裝Windows版的LMS跟Daphie的LMS交叉測試看看是不是LMS的問題。

Hi tetsuka兄 :

小弟找到問題了 ,要播超過48K以上的flac ,要在已下項目更改-小弟爬文找到Squeezelite論壇,,[目前noel V4在小弟lms只能撥48K已下],
Max sample rate 改 192000
Sample rates supported, allows output to be off when Squeezelite is started (-r) less>

Squeezelite - playing 192khz files via 96khz DAC? (slimdevices.com)

[tetsuka]

Hi tetsuka兄 :

小弟找到問題了 ,要播超過48K以上的flac ,要在已下項目更改-小弟爬文找到Squeezelite論壇,,[目前noel V4在小弟lms只能撥48K已下],
Max sample rate 改 192000
Sample rates supported, allows output to be off when Squeezelite is started (-r) less>

Squeezelite - playing 192khz files via 96khz DAC? (slimdevices.com)

恭喜chgeorge兄找出問題點了，如果有其他網兄有遇到相同的問題也可以參考看看。
不過這樣子看來主要問題點應該還是出現在USB DAC的相容性上面。

[seeteeyou]

http://www.stsd99.com/phpBB3/viewtop...p=19520#p19520

Noël V4 真是...真是太贊了~一開聲整個停不下來!

原本當撥放用的pi4b V1.2 可能體質不佳,這版超頻後怪怪的
換另一台就正常了~
之前撥48Khz倍數採樣仍舊會停掉,要重開機才行
倒是撥44Khz倍數的352Khz正常,懷疑自己的fifopi可能有問題~
等有空閒些再來測試

期待分享密秘武器+1

那麼 Rev 1.4 的 8GB 版本樹莓派 4 是否比較適合穩定／正常的超頻呢？

https://www.jeffgeerling.com/comment...#comment-13638

over_voltage=15
arm_freq=2375
gpu_freq=775
arm_freq_min=2300

This will boot and work prfectly. This is as far as one can push raspberry pi 400, IF one is using STOCK power supply. With stronger power supply, you could go up to 2.5-2.7 ghz.

https://forums.tomshardware.com/thre...#post-22059571

Actually, you can bring it up to 2.35 GHz. I have been running my Raspberry Pi 4B 8GB unit at this speed since the Sep-2020 firmware updates. Stable as a rock, no lock-ups, no crashes. I use "over_voltage=15". (Use 16 and the Pi4 won't boot). Also, you don't need to use "force_turbo=1" to achieve 2.35 GHz. I don't include that line in my config.txt files on my Pi 4B 8GB and my new Pi 400, and they both run stable at 2.35 GHz. You do need good cooling if you are going to run at these speeds though. I use an Argon One case for my Pi4B 8GB. My Pi 400 is able to run at 2.35GHz without extra cooling (its massive heat spreader is excellent at keeping thermals in check).Here are the lines I use in my "/boot/config.txt" file:
---
[all]
arm_64bit=1
hdmi_enable_4kp60=1
over_voltage=15
arm_freq=2350
gpu_freq=750
gpu_mem=256
---

Even if your monitor is only Full HD 1080p, you should still add the "hdmi_enable_4kp60=1" line as this sets the GPU's base clock from 500MHz to 550MHz.

https://forums.tomshardware.com/thre...#post-22067725

Is there something about 8GB Raspberry Pi which makes them better for overclocking?

It's PMIC runs at 1.5MHz instead of 1MHz like in the previous models of RPI4 model B. Means 50% more energy can be pumped to the 1V rail.

Our 4GB units rebooted when stressed with linpack on all four cores - above cca 1860 MHz. 8GB model is fine. The effect of overheating the PMIC and its inductors decreases output current, i.e. if you let it run at higher temperature, it reboots sooner (1-4GB model).

Look at the PMIC on 8GB model and compare it to the CM4 - it's the same. And in Raspi 400 also the same, upgraded layout and presumably frequency.

I run my 8GB model at 2200MHz with over_voltage=8, but I might try higher. Passive cooling with CooliPi.

---

可是 pCP 7.0.0 開始還有其他選擇：

https://docs.picoreplayer.org/releases/pcp700/

Includes support for RPi 400 and CM4 boards.

The Raspberry Pi 4 has worse overclocking potential than the Compute Module 4 and Pi 400
https://www.notebookcheck.net/The-Ra....504556.0.html

而且 Ian 也曾經解釋為何沒有原生 Wi-Fi 的樹莓派 2 比較優秀：

https://www.diyaudio.com/forums/pc-b...ml#post5421318

1. Raspberry Pi 2 model B with Volumio, Moode or piCorePlayer or any other player software.The reason I still prefer Pi 2 is that I don't like the noisy Wifi on Pi 3. It doesn't stop working even it is disabled.

https://www.diyaudio.com/forums/digi...ml#post5482313

Nowadays you can get a Raspberry Pi (I prefer the 2B model which does not have built-in WiFi) and an Allo.com Kali reclocker and get I2S output. Load the Pi with PiCorePlayer and it runs pretty much just like the Touch... you can even add a screen if you want (I haven't, as I want to keep the electrical activity and noise to a minimum).

下個月初就可以買到這種 CM4 了，只需要 USB DAC 的話（沒有 GPIO）就可以選擇沒有 Wi-Fi 的 CM4 型號：

https://item.taobao.com/item.htm?id=637895611734

[cuhulong]

有關....
小弟找到問題了 ,要播超過48K以上的flac ,要在已下項目更改-小弟爬文找到Squeezelite論壇,,[目前noel V4在小弟lms只能撥48K已下],
Max sample rate 改 192000
....
我的noel V4 都沒設定(空白) 接 9038 PRO的DAC 能正常播放192K 24BIT與352.8KHz的flac !