Thanks for the details, but CFAST is a completely new standard that has little in common with CF cards and also requires totally different adapters.
Regarding the UDMA work around hints: Could you help me collect all information together we currently have about it (info from axis developer, etc.) so I can create a new wiki page describing the task and then approach some people. Regards Sebastian On Sat, Feb 4, 2012 at 20:28, Andrey Filippov <support-list@support.elphel.com> wrote: > 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 > <sebastian.pichelho...@gmail.com> 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 >> Support-list@support.elphel.com >> http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com > > _______________________________________________ Support-list mailing list Support-list@support.elphel.com http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com