Wow, thanks, I never realized there were so many different speeds for
Flash memory. Went down to the camera store and bought a couple
different brands of fast SD Cards.
It kind of made the problem worse!
Now the hangups happen less often, but when they do, they are
significantly longer - like 30 sec!
I can deal with a relatively high thread latency, but I can't believe
a driver would lock out the whole system for that long.
Frank
--- In <> wrote:
>
> I've seen the same thing on the TS7250, but when writing to the on
board flash.
> It's probably the same thing. I imagine interrupts are disabled by
the kernel when writing to the flash.
> The SD is probably smarter though. It's probably blocking access
till it's done.
> Maybe there is an ioctl call to detect busy you could use
> You could get a faster SD card.
> Larry
>
> From: "Frank Pagliughi" <>
> Date: 2007/08/07 Tue PM 01:44:02 EST
> To:
> Subject: [ts-7000] SD Card write delays
>
> Hey All,
>
> I'm using a TS-7260 for a data-logger type of application, using a
> slightly modified ts11 kernel, the on-board flash for the root file
> system, with an SD Card mounted.
>
> The application writes its data to the SD Card, but the writes
> occasionally lock up the whole system for something like 8-10 seconds.
> I'm guessing when a block is being erased/written. Seems that
> everything running at user level just stops for that time.
>
> Is anyone (everyone) else seeing this? Is there a workaround?
>
> Any help would be apreciated.
>
> Frank
>
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