Олег Яблонский

Thank you for answers guys. It seems I understand now the way I should explore.

I want to have my SDCard storage fully encrypted including /etc and /home so it can be used with particular OrangePI Zero board. USB drive is not an option for me, so I thought for SPI-boot with some storage keys for SDCard.

Hello, Is such configuration possible: 1. Orange Pi Zero + 2. SPI-boot with no USB storage 3. SD Card has armbian files, but it is not bootable. I red that there is configuration with SPI-boot + USB storage, but not sure if there is a guide/possibility to continue use SD Card. Is that possible, is there any guide? Thank you.

tried mainline. it is the same. Also one more interesting thing may be related is that it doesn't detect more than 6 USB-Audio cards. For instance I use two hubs with 4 cards each. Any 6 of them are detected fine but not more. Or is there some limitation at usb/udev/alsa/kernel level?

Ok, thank you. I will start with mainlien kernel.

Sure. 3 cards (recording start immediately after reboot) orangepizero:~$ cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 10: 152 0 0 0 sunxi_gpio_irq_chip xradio_irq 29: 5980 4478 6802 4509 GIC arch_timer 30: 0 0 0 0 GIC arch_timer 32: 541 0 0 0 GIC uart0 38: 24 0 0 0 GIC twi0 39: 18 0 0 0 GIC twi1 43: 0 0 0 0 GIC PA 49: 152 0 0 0 GIC PG 50: 0 0 0 0 GIC sunxi_timer0 63: 0 0 0 0 GIC Thermal 72: 0 0 0 0 GIC sunxi-rtc alarm 77: 0 0 0 0 GIC PL 81: 0 0 0 0 GIC arisc_hwmsgbox_irq 82: 0 0 0 0 GIC sunxi_dmac 90: 0 0 0 0 GIC cedar_dev 92: 5415 0 0 0 GIC sunxi-mmc 93: 6634 0 0 0 GIC sunxi-mmc 97: 0 0 0 0 GIC spi0 98: 0 0 0 0 GIC spi1 103: 1 0 0 0 GIC sunxi_usb_udc 104: 0 0 0 0 GIC ehci_hcd:usb1 105: 0 0 0 0 GIC ohci_hcd:usb5 106: 164 0 0 0 GIC ehci_hcd:usb2 107: 0 0 0 0 GIC ohci_hcd:usb6 108: 0 0 0 0 GIC ehci_hcd:usb3 109: 0 0 0 0 GIC ohci_hcd:usb7 110: 585 0 0 182786 GIC ehci_hcd:usb4 111: 0 0 0 0 GIC ohci_hcd:usb8 114: 1411 0 0 0 GIC gmac0 119: 8532 0 0 0 GIC dispaly IPI0: 0 0 0 0 CPU wakeup interrupts IPI1: 0 0 0 0 Timer broadcast interrupts IPI2: 5013 5285 5030 4738 Rescheduling interrupts IPI3: 145 152 55 157 Function call interrupts IPI4: 1 3 0 1 Single function call interrupts IPI5: 0 0 0 0 CPU stop interrupts IPI6: 0 0 0 0 CPU backtrace IPI7: 0 0 0 0 completion interrupts Err: 0 File sizes (capturing started the same time among all files and filename postfix is actual timestamp of that start): -rw-r--r-- 1 root root 6205044 Dec 20 20:40 arecord.mic.2_1513802382.wav -rw-r--r-- 1 root root 6205044 Dec 20 20:40 arecord.mic.1_1513802382.wav -rw-r--r-- 1 root root 6205044 Dec 20 20:40 arecord.mic.0_1513802382.wav 4 cards (rebooted after 3 cards and fresh recording start) orangepizero:~$ cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 10: 179 0 0 0 sunxi_gpio_irq_chip xradio_irq 29: 7541 6781 8762 5226 GIC arch_timer 30: 0 0 0 0 GIC arch_timer 32: 558 0 0 0 GIC uart0 38: 24 0 0 0 GIC twi0 39: 18 0 0 0 GIC twi1 43: 0 0 0 0 GIC PA 49: 179 0 0 0 GIC PG 50: 0 0 0 0 GIC sunxi_timer0 63: 0 0 0 0 GIC Thermal 72: 0 0 0 0 GIC sunxi-rtc alarm 77: 0 0 0 0 GIC PL 81: 0 0 0 0 GIC arisc_hwmsgbox_irq 82: 0 0 0 0 GIC sunxi_dmac 90: 0 0 0 0 GIC cedar_dev 92: 7427 0 0 0 GIC sunxi-mmc 93: 7637 0 0 0 GIC sunxi-mmc 97: 0 0 0 0 GIC spi0 98: 0 0 0 0 GIC spi1 103: 1 0 0 0 GIC sunxi_usb_udc 104: 0 0 0 0 GIC ehci_hcd:usb1 105: 0 0 0 0 GIC ohci_hcd:usb5 106: 165 0 0 0 GIC ehci_hcd:usb2 107: 0 0 0 0 GIC ohci_hcd:usb6 108: 0 0 0 0 GIC ehci_hcd:usb3 109: 0 0 0 0 GIC ohci_hcd:usb7 110: 583 0 0 350720 GIC ehci_hcd:usb4 111: 0 0 0 0 GIC ohci_hcd:usb8 114: 1201 0 0 0 GIC gmac0 119: 11105 0 0 0 GIC dispaly IPI0: 0 0 0 0 CPU wakeup interrupts IPI1: 0 0 0 0 Timer broadcast interrupts IPI2: 6127 6553 5499 4628 Rescheduling interrupts IPI3: 138 167 47 163 Function call interrupts IPI4: 3 3 0 3 Single function call interrupts IPI5: 0 0 0 0 CPU stop interrupts IPI6: 0 0 0 0 CPU backtrace IPI7: 0 0 0 0 completion interrupts Err: 0 File sizes (you can see that two have less size while they started the same time and with absolutely same arecord and card parameters) -rw-r--r-- 1 root root 12240044 Dec 20 20:35 arecord.mic.2_1513801965.wav -rw-r--r-- 1 root root 12240044 Dec 20 20:35 arecord.mic.3_1513801965.wav -rw-r--r-- 1 root root 14195044 Dec 20 20:35 arecord.mic.0_1513801965.wav -rw-r--r-- 1 root root 14195044 Dec 20 20:35 arecord.mic.1_1513801965.wav arecord command used for all cards (only CARD name is different among the cards): arecord -v -r 48000 -c 1 -D plughw:CARD=Device,DEV=0 -f S16_LE -d 1800 --buffer-size=170000 --fatal-errors kernel: orangepizero:~$ uname -a Linux orangepizero 3.4.113-sun8i #16 SMP PREEMPT Tue Jun 13 14:15:57 CEST 2017 armv7l armv7l armv7l GNU/Linux SD card speed. It is fast. I tested it with simultaneous recording of 10 streams with 2Mbps bitrate each with no issue. DD test: orangepizero:~$ dd if=/dev/zero of=testfile bs=1M count=1000 oflag=direct 1000+0 records in 1000+0 records out 1048576000 bytes (1.0 GB, 1000 MiB) copied, 49.8259 s, 21.0 MB/s And mount options: /dev/mmcblk0p1 on /var/log.hdd type ext4 (rw,noatime,nodiratime,errors=remount-ro,commit=600) If you want me to perform any test or try a specific configuration I am ready to make it.

Hello, I use Orange Pi Zero + 4 ports USB hub + CM108 USB-Audio cards with mic-in. All by default. Each mic is captured with sipmle commands like: arecord -v -r 44100 -c 1 -D "hw:CARD=Device_1,DEV=0" -f S16_LE > mic1.wav When 3 cards capturing simultaneous all working well. But if I start capturing with 4th card simultaneous I get two cards with crackling recorded audio. I even can see that arecord saves less data from these two cards (file size is less than with 3 cards). No error/warning provided anywhere (dmesg, syslog, arecord). Moreover, if I stops recording from one card - it becomes normal for rest of them instantly. And this strange behavious exists in all cases I tried. SImultaneous recording start for 4 cards, start recording later for 4th card, many dirfferent 4 ports USB hubs, USB 1.1, USB 2.0, different sudio cards (CM108).... Very rarely I could get normal operation for 4th cards simultaneouly, but for the same configuration it worked bad again after restart. Could you please suggest how I can attack this issue? Do you need any info in addition to get better view? Thank you.