[U-Boot] [PATCH] imx: Use a convenient default value for SYS_MALLOC_F_LEN

[Tom Rini <trini@konsulko.com>]

On Fri, May 03, 2019 at 12:51:24PM +0000, Auer, Lukas wrote:
> On Fri, 2019-05-03 at 09:25 -0300, Fabio Estevam wrote:
> > Commit 3a7c45f6a772 ("simple-bus: add DM_FLAG_PRE_RELOC flag to
> > simple-bus driver") causes some i.MX boards that were converted
> > to DM, such as warp7, to fail to boot.
> > 
> > As explained by Lukas Auer:
> > 
> > "With the patch, U-Boot probes the drivers for devices under simple-bus
> > device tree nodes in the pre-relocation device model. The default value
> > of CONFIG_SYS_MALLOC_F_LEN (0x400) leaves U-Boot with not enough memory to
> > do this, causing it to hang."
> > 
> > Fix this problem by providing a convenient default value for
> > CONFIG_SYS_MALLOC_F_LEN.
> > 
> > Reported-by: Pierre-Jean Texier <pjtexier@koncepto.io>
> > Suggested-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
> > Signed-off-by: Fabio Estevam <festevam@gmail.com>
> > ---
> >  arch/arm/mach-imx/Kconfig | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
> > index ec09ef240f..a7a7d84b7a 100644
> > --- a/arch/arm/mach-imx/Kconfig
> > +++ b/arch/arm/mach-imx/Kconfig
> > @@ -90,3 +90,6 @@ config DDRMC_VF610_CALIBRATION
> >  	  NXP does NOT recommend to perform this calibration at each boot. One
> >  	  shall perform it on a new PCB and then use those values to program
> >  	  the ddrmc_cr_setting on relevant board file.
> > +
> > +config SYS_MALLOC_F_LEN
> > +	default 0x2000
> 
> The file arch/arm/mach-imx/Kconfig is unconditionally include, so this
> will set SYS_MALLOC_F_LEN for other boards as well. What I have done
> locally is to include a depends on with all sub-families with DM
> support. If you want you can just use it or I can also submit it as
> well.
> 
> config SYS_MALLOC_F_LEN
> 	default 0x2000
> 	depends on ARCH_IMX8 || ARCH_IMX8M || ARCH_MX7 || ARCH_MX7ULP || \
> 		   ARCH_MX6 || ARCH_MX5

But really we should do that in ./Kconfig with the other places that
have a default value for SYS_MALLOC_F_LEN.  And then once we've gotten
everyone converted we can try and figure out a perhaps cleaner way to
handle these kind of "default per SoC" values.

-- 
Tom
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