On 03/27/14 17:50, miguelro...@ua.pt wrote:

> Am I missing something or Ovmf does not support file writing?

OVMF is only relevant here if the FAT32 filesystem hosting the file that
you're trying to rewrite hangs off the end of a driver chain that OVMF
participates in.

As in, if there's a virtio-scsi or virtio-blk device that backs the
guest-side file. In these cases code in OvmfPkg is indeed relevant.
However, these virtio drivers don't deny write access on their own, they
only "forward" read-only status if you asked qemu on the command line to
present the drive as read-only.

Other drivers (IDE etc) could be doing the same to you, given similar
(r/o) qemu drive configuration, but the code for those drivers is
outside OvmfPkg.

Laszlo


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