[PATCH] bootcount_ext: Add flag to enable/disable bootcount
Simon Glass
sjg at chromium.org
Fri Mar 13 01:36:08 CET 2020
Hi Frédéric,
On Thu, 12 Mar 2020 at 08:36, Frédéric Danis
<frederic.danis at collabora.com> wrote:
>
> Hi Simon,
>
> On 12/03/2020 04:22, Simon Glass wrote:
>
> Hi Frédéric,
>
> On Wed, 11 Mar 2020 at 05:00, Frédéric Danis <frederic.danis at collabora.com> wrote:
> >
> > After a successful upgrade, multiple problem during boot sequence may
> > trigger the altbootcmd process.
> > This patch adds a 3rd byte to the bootcount file to enable/disable the
> > bootcount check.
> > When reading old bootcount file, 2 bytes long, it will consider that
> > bootcount is enabled, and update the file accordingly.
> >
>
> Is this format documented somewhere? Should it perhaps have a version number so you can copy with future changes?
>
>
> I will change the Magic byte and add a version number.
>
> Can you give me advice where I should add this format documentation?
I suggest doc/README.bootcount
>
>
> > The bootcount file is only saved when `upgrade_available` is true, this
> > allows to save writes to the filesystem.
> >
> > Signed-off-by: Frédéric Danis <frederic.danis at collabora.com>
> > ---
> > drivers/bootcount/bootcount_ext.c | 24 ++++++++++++++++++------
> > 1 file changed, 18 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/bootcount/bootcount_ext.c b/drivers/bootcount/bootcount_ext.c
> > index 075e590896..740bce0296 100644
> > --- a/drivers/bootcount/bootcount_ext.c
> > +++ b/drivers/bootcount/bootcount_ext.c
> > @@ -9,6 +9,8 @@
> >
> > #define BC_MAGIC 0xbc
> >
> > +static u8 upgrade_available = 1;
> > +
> > void bootcount_store(ulong a)
> > {
> > u8 *buf;
> > @@ -21,13 +23,18 @@ void bootcount_store(ulong a)
> > return;
> > }
> >
> > - buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, 2);
> > + /* Only update bootcount during upgrade process */
> > + if (!upgrade_available)
> > + return;
> > +
> > + buf = map_sysmem(CONFIG_SYS_BOOTCOUNT_ADDR, 3);
> > buf[0] = BC_MAGIC;
> > buf[1] = (a & 0xff);
> > + buf[2] = upgrade_available;
> > unmap_sysmem(buf);
> >
> > ret = fs_write(CONFIG_SYS_BOOTCOUNT_EXT_NAME,
> > - CONFIG_SYS_BOOTCOUNT_ADDR, 0, 2, &len);
> > + CONFIG_SYS_BOOTCOUNT_ADDR, 0, 3, &len);
>
> Separate from this patch...to me it seems ugly to put this info in CONFIG. Could it not be structured as a driver, with device tree used to hold the information?
>
> See for example fs_loader.txt
>
>
> OK, I will try to send another patch for this … but I don't know when
>
It looks like we already have chosen.txt which describes the
device-tree binding. Perhaps it can fit into that?
Regards,
Simon
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