Hi all, As the merge window has closed, I'd just like to bump my old mail below and ask for comments. Currently the actual register to use is hard-coded. I'm unsure of what the current status is when it comes to include new architecture specific CONFIG_*-options.
The bootcount-feature is supported in u-boot for some PPC-boards. The patch below is basically a rip-off of one of these features, adapted for the AT91SAM9-architecture. It is tested on an olimex board with an at91sam9260. I'd be very happy if we could get this feature mainlined. (I've also got some replies off-list, from people wanting to use this feature.) Thanks in advance! Best regards, Anders On Thu, Jan 14, 2010 at 15:00, Anders Darander <anders.daran...@gmail.com> wrote: > From: Anders Darander <a...@datarespons.se> > > Use AT91_GPBR 3 as a bootcount register. > > Signed-off-by: Anders Darander <a...@datarespons.se> > --- > cpu/arm926ejs/at91/cpu.c | 28 ++++++++++++++++++++++++++++ > 1 files changed, 28 insertions(+), 0 deletions(-) > > diff --git a/cpu/arm926ejs/at91/cpu.c b/cpu/arm926ejs/at91/cpu.c > index f2f7b62..09c1376 100644 > --- a/cpu/arm926ejs/at91/cpu.c > +++ b/cpu/arm926ejs/at91/cpu.c > @@ -31,6 +31,11 @@ > #define AT91_MAIN_CLOCK 0 > #endif > > +/* The at91sam9260 has 4 GPBR (0-3), we'll use the last one, nr 3, > + * to keep track of the bootcount. */ > +#define AT91_GPBR_BOOTCOUNT_REGISTER 3 > +#define AT91_BOOTCOUNT_ADDRESS (AT91_GPBR + 4*AT91_GPBR_BOOTCOUNT_REGISTER) > + > int arch_cpu_init(void) > { > return at91_clock_init(AT91_MAIN_CLOCK); > @@ -52,3 +57,26 @@ int print_cpuinfo(void) > return 0; > } > #endif > + > +#ifdef CONFIG_BOOTCOUNT_LIMIT > + > +void bootcount_store (ulong a) > +{ > + volatile ulong *save_addr = > + (volatile ulong *)(AT91_BASE_SYS + AT91_BOOTCOUNT_ADDRESS); > + > + *save_addr = (BOOTCOUNT_MAGIC & 0xffff0000) | a; > +} > + > +ulong bootcount_load (void) > +{ > + volatile ulong *save_addr = > + (volatile ulong *)(AT91_BASE_SYS + AT91_BOOTCOUNT_ADDRESS); > + > + if ((*save_addr & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000)) > + return 0; > + else > + return (*save_addr & 0x0000ffff); > +} > + > +#endif /* CONFIG_BOOTCOUNT_LIMIT */ > -- > 1.6.6 > > -- Anders Darander EPO guidelines 1978: "If the contribution to the known art resides solely in a computer program then the subject matter is not patentable in whatever manner it may be presented in the claims." _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot