[PATCH 4/4] mci: add MBR write and read function to block devices

[Michael Grzeschik]

On Wed, Oct 26, 2016 at 11:09:33AM +0200, Michael Grzeschik wrote:
> On Tue, Oct 18, 2016 at 08:23:22AM +0200, Sascha Hauer wrote:
> > On Mon, Oct 17, 2016 at 03:29:23PM +0200, Michael Grzeschik wrote:
> > > With this patch it is possible to write an mbr partition table to the
> > > mci block device. By setting the device property "dos_partitions" of the
> > > mmc device node, it is possible to write back the new partition layout
> > > in the common cmdlinepart notation. The property can also be read back.
> > > 
> > > Signed-off-by: Michael Grzeschik <m.grzeschik at pengutronix.de>
> > > ---
> > >  drivers/mci/mci-core.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++++
> > >  1 file changed, 122 insertions(+)
> > > 
> > > diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
> > > index 4e176f7..c0013a1 100644
> > > --- a/drivers/mci/mci-core.c
> > > +++ b/drivers/mci/mci-core.c
> > > @@ -33,9 +33,11 @@
> > >  #include <asm-generic/div64.h>
> > >  #include <asm/byteorder.h>
> > >  #include <block.h>
> > > +#include <fcntl.h>
> > >  #include <disks.h>
> > >  #include <of.h>
> > >  #include <linux/err.h>
> > > +#include <cmdlinepart.h>
> > >  
> > >  #define MAX_BUFFER_NUMBER 0xffffffff
> > >  
> > > @@ -1527,6 +1529,122 @@ static void mci_info(struct device_d *dev)
> > >  		extract_mtd_year(mci));
> > >  }
> > >  
> > > +static char *print_size(uint64_t s)
> > > +{
> > > +	if (!(s & ((1 << 20) - 1)))
> > > +		return basprintf("%lldM", s >> 20);
> > > +	if (!(s & ((1 << 10) - 1)))
> > > +		return basprintf("%lldk", s >> 10);
> > > +	return basprintf("0x%lld", s);
> > 
> > s/lld/llx/
> 
> Why that? This will break the typical layout compared
> to all other users of the kernelcmdline syntax.

As I now realize you only ment the last line, this sure makes
sense. I will fix it. But the mtd layer I copied this from
has the same issue. Will fix that aswell.

Thanks,
Michael

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