On 05/30/2017 07:17 AM, Peter Maydell wrote: > On 8 May 2017 at 06:08, Rob Landley <r...@landley.net> wrote: >> As far as I can tell "qemu-system-arm -M vexpress-a9" only implements sd >> card, not any conventional hard drive, and it uses an sdcard block size >> of 262144 bytes rounded down. This means when I create a squashfs image >> and feed it in through the sd card, it truncates it. >> >> Wouldn't -sd rounding _up_ be more useful? > > This vaguely rings a bell but I forget exactly. I think the > intention is that you're supposed to pass it a file of > exactly the right length, not one that's too short. If we > rounded up, then it would create the awkward question of > "what happens when the guest writes into the bit of the > sd card image that doesn't actually exist in the image file". > > I'm not strongly attached to the current behaviour (especially > if the behaviour for sd card images doesn't match that for > hd images and other kinds of disk), but I think that may have > been the "this is more complicated than it appears on the surface" > reason that nobody's got round to trying to change the behaviour. > It's been years though, so I might just be completely misremembering.
I worked around it by switching to the -M virt machine. (The project is https://github.com/landley/mkroot if you're curious.) Thanks, Rob
