[U-Boot] [PATCH] arm: mx6: Reduce SPL malloc pool size

[Marek Vasut]

On Wednesday, November 25, 2015 at 11:40:36 AM, Przemyslaw Marczak wrote:
> Hello Tim, Marek
> 
> On 11/20/2015 10:40 PM, Tim Harvey wrote:
> > On Fri, Nov 20, 2015 at 12:43 PM, Marek Vasut <marex at denx.de> wrote:
> >> Using 50 MiB malloc pool in SPL is nonsense. Since the caches are not
> >> enabled in SPL, it takes 2 seconds to init the pool and has no obvious
> >> benefit. Reduce the size to 1 MiB.
> >> 
> >> Signed-off-by: Marek Vasut <marex at denx.de>
> >> Cc: Stefano Babic <sbabic at denx.de>
> >> Cc: Tim Harvey <tharvey at gateworks.com>
> >> ---
> >> 
> >>   include/configs/imx6_spl.h | 6 +++---
> >>   1 file changed, 3 insertions(+), 3 deletions(-)
> >> 
> >> diff --git a/include/configs/imx6_spl.h b/include/configs/imx6_spl.h
> >> index 1744f2c..43ce7fe 100644
> >> --- a/include/configs/imx6_spl.h
> >> +++ b/include/configs/imx6_spl.h
> >> @@ -63,15 +63,15 @@
> >> 
> >>   #if defined(CONFIG_MX6SX) || defined(CONFIG_MX6UL) ||
> >>   defined(CONFIG_MX6SL) #define CONFIG_SPL_BSS_START_ADDR     
> >>   0x88200000
> >> 
> >> -#define CONFIG_SPL_BSS_MAX_SIZE        0x100000        /* 1 MB */
> >> +#define CONFIG_SPL_BSS_MAX_SIZE        0x100000                /* 1 MB
> >> */
> >> 
> >>   #define CONFIG_SYS_SPL_MALLOC_START    0x88300000
> >> 
> >> -#define CONFIG_SYS_SPL_MALLOC_SIZE     0x3200000       /* 50 MB */
> >> +#define CONFIG_SYS_SPL_MALLOC_SIZE     0x100000                /* 1 MB
> >> */
> >> 
> >>   #define CONFIG_SYS_TEXT_BASE           0x87800000
> >>   #else
> >>   #define CONFIG_SPL_BSS_START_ADDR      0x18200000
> >>   #define CONFIG_SPL_BSS_MAX_SIZE                0x100000        /* 1 MB
> >>   */ #define CONFIG_SYS_SPL_MALLOC_START    0x18300000
> >> 
> >> -#define CONFIG_SYS_SPL_MALLOC_SIZE     0x3200000       /* 50 MB */
> >> +#define CONFIG_SYS_SPL_MALLOC_SIZE     0x100000        /* 1 MB */
> >> 
> >>   #define CONFIG_SYS_TEXT_BASE           0x17800000
> >>   #endif
> >>   #endif
> >> 
> >> --
> >> 2.1.4
> > 
> > Acked-by: Tim Harvey <tharvey at gateworks.com>
> > 
> > thanks for dropping 2 secs off our time to boot!
> > 
> > Tim
> 
> The boot time for SPL and U-Boot can be reduced more if
> CONFIG_SYS_MALLOC_CLEAR_ON_INIT is unset (default is set).

This might confuse DM, so I don't want this. DM checks if it's structures were
already inited and if we don't clear the malloc area, they would be.

> Then it doesn't matter what is the size of malloc pool but it's not
> cleared - so needs check if malloc() calls should be changed to calloc().
> 
> Best regards,

Best regards,
Marek Vasut