[U-Boot] [PATCH v1 4/5] bootcount: display5: spl: Extend SPL to support bootcount checking

[Lukasz Majewski <lukma@denx.de>]

On Mon, 26 Feb 2018 16:22:25 +0100
Lukasz Majewski <lukma@denx.de> wrote:

> Hi Stefan,
> 
> > Hi Lukasz,
> > 
> > On 26.02.2018 13:22, Lukasz Majewski wrote:  
> > > This patch is necessary for providing basic bootcount checking in
> > > the case of using "falcon" boot mode.
> > > 
> > > It forces u-boot proper boot, when we exceed the number of errors.
> > > 
> > > Signed-off-by: Lukasz Majewski <lukma@denx.de>
> > > ---
> > > 
> > >   board/liebherr/display5/spl.c | 6 +++++-
> > >   1 file changed, 5 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/board/liebherr/display5/spl.c
> > > b/board/liebherr/display5/spl.c index 0a36e656c0..5812f71dfc
> > > 100644 --- a/board/liebherr/display5/spl.c
> > > +++ b/board/liebherr/display5/spl.c
> > > @@ -20,6 +20,7 @@
> > >   #include <environment.h>
> > >   #include <fsl_esdhc.h>
> > >   #include <netdev.h>
> > > +#include <bootcount.h>
> > >   #include "common.h"
> > >   
> > >   DECLARE_GLOBAL_DATA_PTR;
> > > @@ -194,6 +195,9 @@ void board_init_f(ulong dummy)
> > >   	/* Clear the BSS. */
> > >   	memset(__bss_start, 0, __bss_end - __bss_start);
> > >   
> > > +	/* Increment bootcount */
> > > +	bootcount_inc();
> > > +    
> > 
> > Wouldn't it be better, to move this incrementing into some common
> > code, so that other platform who might use the bootcounter in SPL
> > in the future could also use it without code duplication?
> > 
> > What do you think?  
> 
> To provide this functionality I need to add bootcount_inc() and check
> bootcount_error(). Both are static inlines from  #include
> <bootcount.h>
> 
> However, maybe it would be better to put this code to generic SPL. I
> will try to do it for v2.

The problem here is that we need very early code to do this (increment
bootcount). Now it is done in SPL's board_init_f.
It is the first C function, called from crt0.S asm file.

I'm not sure if we have such early code common for all archs/platforms.

If we put this bootcount_inc() to latter SPL code, we risk hanging in
SPL with WDT reset and not incremented bootcount...

Also the bootcount shall be incremented in the same function where we
enable and initialize WDT.

> 
> Thanks for the idea.
> 
> > 
> > Thanks,
> > Stefan  
> 
> 
> 
> 
> Best regards,
> 
> Lukasz Majewski
> 
> --
> 
> DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de




Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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