[PATCH 6/7] ddr: altera: arria10: Change %i to %u for printf

[Tom Rini]

On Wed, Apr 15, 2020 at 05:16:52PM +0200, Marek Vasut wrote:
> On 4/15/20 5:14 PM, Tom Rini wrote:
> > On Wed, Apr 15, 2020 at 04:58:31PM +0200, Marek Vasut wrote:
> >> On 4/15/20 4:56 PM, Tom Rini wrote:
> >>> On Wed, Apr 15, 2020 at 02:45:08PM +0200, Marek Vasut wrote:
> >>>> On 4/15/20 11:00 AM, Ley Foon Tan wrote:
> >>>>> Tiny printf doesn't support %i, change to %u.
> >>>>>
> >>>>> Signed-off-by: Ley Foon Tan <ley.foon.tan at intel.com>
> >>>>> ---
> >>>>>  drivers/ddr/altera/sdram_arria10.c | 2 +-
> >>>>>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>>>>
> >>>>> diff --git a/drivers/ddr/altera/sdram_arria10.c b/drivers/ddr/altera/sdram_arria10.c
> >>>>> index e3f11984a978..8acf324117af 100644
> >>>>> --- a/drivers/ddr/altera/sdram_arria10.c
> >>>>> +++ b/drivers/ddr/altera/sdram_arria10.c
> >>>>> @@ -195,7 +195,7 @@ static void sdram_init_ecc_bits(u32 size)
> >>>>>  
> >>>>>  	dcache_enable();
> >>>>>  
> >>>>> -	printf("DDRCAL: Scrubbing ECC RAM (%i MiB).\n", size >> 20);
> >>>>> +	printf("DDRCAL: Scrubbing ECC RAM (%u MiB).\n", size >> 20);
> >>>>>  	memset((void *)0x8000, 0, size - 0x8000);
> >>>>>  	flush_dcache_all();
> >>>>>  	printf("DDRCAL: Scrubbing ECC RAM done.\n");
> >>>>
> >>>> Yes, sadly, tiny printf is broken so we need to patch code to work
> >>>> around that breakage.
> >>>
> >>> Yes, limited by design, thanks for changing.
> >>
> >> This code could be used without tiny printf, so this change is unnecessary.
> > 
> > You've got it backwards.  Code that could be used by tiny printf needs
> > to use the more limited set of formats.  But this should have been using
> > %u all along?  %i is for int, %u is unsigned int.
> 
> That would mean most of U-Boot needs to be limited to the subset of
> formatting characters supported by tiny printf, which is unrealistic.

Not at all.  Only the code that's used in SPL and in tiny printf
situations needs to be limited to reduced set.  Which is why we're at
4.5 years in and just now "oh, %i doesn't work?".

-- 
Tom
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