Sebastian, I just replied Carlos and wrote that the only problem with SATA devices was with the old SSD made actually from the CF cards. Adapter is transparent, so if the CF card does not work in the camera directly, it will not work with the adapter. For slow applications it is possible to disable DMA in the camera (needs adding the lying card to the blacklist and recompiling the software).
Devices support some of 3 modes: 1) PIO (slow and loads CPU a lot) 2) DMA - fast 3) UDMA - even faster Most CF cards support only 1 and 3 and respond as if they support 2 also ETRAX processor has a bug in implementation of the UDMA, so UDMA is disabled, that means that in the camera we only have 1 and 2. When the camera detects the disk, it loads the device capabilities (1,2,3), and selects the fastest it can support - 2. But here the lie of the CF card controller comes to the light - and the camera fails to communicate with the disk. There is a black list of those untruthful cards in the driver, we already added some cards there - http://elphel.cvs.sourceforge.net/viewvc/elphel/elphel353-8.0/os/linux-2.6-tag--devboard-R2_10-4/drivers/ide/ide-dma.c?view=markup Axis engineers said that it is possible to mitigate that bug and gave some hints how to do that, but we never worked on it ourselves and it is probably not too easy - otherwise Axis people would do it themselves. But if anybody with the driver development skills would volunteer - we would definitely love that and support such project. Andrey On Sat, Feb 4, 2012 at 11:53 AM, Sebastian Pichelhofer < [email protected]> wrote: > Do you think that http://en.wikipedia.org/wiki/CFast#CFast CFast Cards > could work with this adapter: > > http://www.amazon.de/exec/obidos/ASIN/b003r4ifmg/geizhals1-21/ref=nosim?m=A3JWKAKR8XB7XF > connected to the Elphel camera over SATA. > > To my understanding the card itself acts like a drive and needs no > controller chip betweencard and camera that could lead to running into > the UDMA issues again. But the card itself might use UDMA... ;) > Any educated guesses? > > Regards Sebastian > > _______________________________________________ > Support-list mailing list > [email protected] > http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com >
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