2013/4/17 Jeremy Jongepier <jeremy@xxxxxxxxxxxxxx>: > On 04/17/2013 09:49 AM, Carlos sanchiavedraz wrote: >> >> 2013/4/15 Jeremy Jongepier <jeremy@xxxxxxxxxxxxxx>: >>> >>> On 04/15/2013 10:39 AM, Carlos sanchiavedraz wrote: >>>> >>>> >>>> Just a USB cable from RPi to an A/C to USB adapter, and UA25EX >>>> connected direct to the USB on RPi. >>> >>> >>> >>> Check the current of the adapter, if it's somewhere around 1A you might >>> need >>> a more powerful adapter as the RPi already draws 700mA IIRC. >> >> >> The adapter is the same as that ones to charge mobile phones, just an >> adapter from USB to a switch. I thought it would be enough to plug the >> UA to the RPi and not having to plug it to an USB powered hub, because >> then it may occur problems with other devices plugged in it, and this >> would probably increase problems with audio latency and such. >> > > I haven't had any problems with audio latency and using a powered hub. > > Good to know. I've had some problems before testing some other touch device with USB, but maybe it had to do with the hub was not powered. >>> >>> >>>> IIRC, when configuring using raspi-config, the Modest preset for >>>> overclocking just increases the CPU freq from 700MHz to 800MHz. I >>>> didn't want to risk my SD because I red that issue you mention, but it >>>> seems that anyway I've left without my SD. >>>> >>> >>> What kind of SD are you using? I've used different SD cards with >>> different >>> results. I'm now using a cheap OEM class 10 SD card that does get >>> corrupted >>> quickly but performance is better than other SD cards I've used. Whenever >>> I >>> change something I make a backup now. >> >> >> I'm using a SanDisk 2GB microSD on a SD adapter for the RPi slot. I >> never had any problem until now. >> > > And that while SanDisk SD's are being recommended for use with the RPi. What > core_freq are you using? I chose the Modest preset, so it should be just 800MHz and with no other modification on other freqs. > > >> Do you still can use yours once it is corrupted? I plug it, you can >> see the two partitions mounted for a moment but then it unmount >> itself. I made a backup copy with dd once I configured some >> parameters. I've and tried several times to transfer it to the SD with >> dd again but at about 840MB transfered it stops with a corruption >> error; I only can modify the scripts and config on the first partition >> (boot partition) when it stays mounted for some time. > > > First thing I do when a SD becomes corrupted is wipe all partitions and then > restore an image with dd. I tried it, but when I try to wipe partitions with gparted or any other it unmount itself or say that it's not possible. > If you run into corruption errors the SD might be > defective? At least not until now, never had a problem. I wonder if the reboot cause a physical damage on the SD, but in a reboot it shouldn't happen a peak of voltage to cause that. > > >> >> This could allow me to maybe boot a system in a USB stick, but then I >> waste one USB slot, and I'm afraid that if I buy another SD card it >> could be corrupted again and then it would be wasted money. > > > You can boot from an USB stick connected to a hub. I've tested this when > trying to run a RT kernel on the RPi. But either my USB stick or the RPi > itself has issues with the throughput because I had the idea the RPi was a > lot less responsive and audio was completely distorted. > In worst case, I could plug a USB stick on one slot and in the other the USB hub with the UA and mouse/keyboard/midi-usb..., but I would like to control what happen with SDs cards and when they get unusable/broken because of some corruption. > > Jeremy > > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user -- Carlos sanchiavedraz * Musix GNU+Linux http://www.musix.es _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
