On Fri, Jun 3, 2016 at 12:13 AM, Lee, Chun-Yi <joeyli.ker...@gmail.com> wrote: > This patch adds codes to treat a volatile virtual CD region as a > read-only pmem region, then read-only /dev/pmem* device can be mounted > with iso9660. > > It's useful to work with the httpboot in EFI firmware to pull a remote > ISO file to the local memory region for booting and installation. > > Wiki page of UEFI HTTPBoot with OVMF: > https://en.opensuse.org/UEFI_HTTPBoot_with_OVMF > > Signed-off-by: Lee, Chun-Yi <j...@suse.com> > Cc: Gary Lin <g...@suse.com> > Cc: Dan Williams <dan.j.willi...@intel.com> > Cc: Ross Zwisler <ross.zwis...@linux.intel.com> > Cc: "Rafael J. Wysocki" <r...@rjwysocki.net> > --- > drivers/acpi/nfit.c | 8 +++++++- > drivers/nvdimm/region_devs.c | 26 +++++++++++++++++++++++++- > include/linux/libnvdimm.h | 2 ++ > 3 files changed, 34 insertions(+), 2 deletions(-) > > diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c > index 2215fc8..b100a17 100644 > --- a/drivers/acpi/nfit.c > +++ b/drivers/acpi/nfit.c > @@ -1949,6 +1949,7 @@ static int acpi_nfit_init_mapping(struct acpi_nfit_desc > *acpi_desc, > switch (nfit_spa_type(spa)) { > case NFIT_SPA_PM: > case NFIT_SPA_VOLATILE: > + case NFIT_SPA_VCD: > nd_mapping->start = memdev->address; > nd_mapping->size = memdev->region_size; > break;
Why do we need to distinguish NFIT_SPA_VOLATILE vs NFIT_SPA_VCD, i.e. what happens if something writes to a VCD device?
