[U-Boot] [u-boot-release] [PATCH 2/3] armv8: ls1088a: SPL size reduction

[Sumit Garg]

> -----Original Message-----
> From: York Sun
> Sent: Tuesday, August 29, 2017 9:25 PM
> To: Sumit Garg <sumit.garg at nxp.com>; u-boot at lists.denx.de
> Cc: Prabhakar Kushwaha <prabhakar.kushwaha at nxp.com>; Ruchika Gupta
> <ruchika.gupta at nxp.com>
> Subject: Re: [u-boot-release] [PATCH 2/3] armv8: ls1088a: SPL size reduction
> 
> On 08/29/2017 12:02 AM, Sumit Garg wrote:
> > Using changes in this patch we were able to reduce approx 8k size of
> > u-boot-spl.bin image. Following is breif description of changes to
> > reduce SPL size:
> > 1. Changes in board/freescale/ls1088a/Makefile to remove
> >     compilation of eth.c and cpld.c in case of SPL build.
> > 2. Changes in board/freescale/ls1088a/ls1088a.c to keep
> >     board_early_init_f funcations in case of SPL build.
> > 3. Changes in ls1088a_common.h & ls1088ardb.h to remove driver
> >     specific macros due to which static data was being compiled in
> >     case of SPL build.
> > 4. Enable CONFIG_SYS_DCACHE_OFF in case of SPL build as DCACHE is
> >     not being enabled in case of SPL image but was compiled in to
> >     add redundant code.
> >
> > Signed-off-by: Sumit Garg <sumit.garg at nxp.com>
> > ---
> >
> > Dependent on ls1088 base SD boot target. Also dependent on ls1088 QPSI
> > secure boot target.
> >
> >   board/freescale/ls1088a/Makefile  |  4 +++-
> >   board/freescale/ls1088a/ls1088a.c | 14 ++++++++------
> >   include/configs/ls1088a_common.h  | 20 ++++++++++++++++++++
> >   include/configs/ls1088ardb.h      | 20 ++++++++++++++++++++
> >   4 files changed, 51 insertions(+), 7 deletions(-)
> >
> > diff --git a/board/freescale/ls1088a/Makefile
> > b/board/freescale/ls1088a/Makefile
> > index bdcce9e..0e15031 100644
> > --- a/board/freescale/ls1088a/Makefile
> > +++ b/board/freescale/ls1088a/Makefile
> > @@ -5,6 +5,8 @@
> >   #
> >
> >   obj-y += ls1088a.o
> > +obj-y += ddr.o
> > +ifndef CONFIG_SPL_BUILD
> >   obj-$(CONFIG_TARGET_LS1088ARDB) += eth_ls1088ardb.o
> >   obj-$(CONFIG_TARGET_LS1088AQDS) += eth_ls1088aqds.o -obj-y += ddr.o
> > +endif
> > diff --git a/board/freescale/ls1088a/ls1088a.c
> > b/board/freescale/ls1088a/ls1088a.c
> > index 1860f9c..1c28ab4 100644
> > --- a/board/freescale/ls1088a/ls1088a.c
> > +++ b/board/freescale/ls1088a/ls1088a.c
> > @@ -24,6 +24,13 @@
> >
> >   DECLARE_GLOBAL_DATA_PTR;
> >
> > +int board_early_init_f(void)
> > +{
> > +	fsl_lsch3_early_init_f();
> > +	return 0;
> > +}
> > +
> > +#if !defined(CONFIG_SPL_BUILD)
> >   unsigned long long get_qixis_addr(void)
> >   {
> >   	unsigned long long addr;
> > @@ -324,12 +331,6 @@ int board_init(void)
> >   	return 0;
> >   }
> >
> > -int board_early_init_f(void)
> > -{
> > -	fsl_lsch3_early_init_f();
> > -	return 0;
> > -}
> > -
> >   void detail_board_ddr_info(void)
> >   {
> >   	puts("\nDDR    ");
> > @@ -404,3 +405,4 @@ int ft_board_setup(void *blob, bd_t *bd)
> >   	return 0;
> >   }
> >   #endif
> > +#endif /* defined(CONFIG_SPL_BUILD) */
> > diff --git a/include/configs/ls1088a_common.h
> > b/include/configs/ls1088a_common.h
> > index 63b69f8..fb4c852 100644
> > --- a/include/configs/ls1088a_common.h
> > +++ b/include/configs/ls1088a_common.h
> > @@ -7,6 +7,20 @@
> >   #ifndef __LS1088_COMMON_H
> >   #define __LS1088_COMMON_H
> >
> > +/* SPL build */
> > +#ifdef CONFIG_SPL_BUILD
> > +#define SPL_NO_BOARDINFO
> > +#define SPL_NO_QIXIS
> > +#define SPL_NO_PCI
> > +#define SPL_NO_ENV
> > +#define SPL_NO_RTC
> > +#define SPL_NO_USB
> > +#define SPL_NO_SATA
> > +#define SPL_NO_QSPI
> > +#define SPL_NO_IFC
> > +#define CONFIG_SYS_DCACHE_OFF
> 
> How much space can you save with data cache off? I prefer to leave the cache
> on. Cache is used if PPA is loaded in SPL stage for boost booting speed.
> 
> York
 
As we discussed earlier too, dcache was not enabled in SPL for our layerscape platforms. I have just
removed redundant dcache specific code from SPL. I do save 2KB memory by removing redundant
dcache specific code.

Also we do need more space (approx.. 6KB) on OCRAM for header. As currently we are only supporting
single key in header (Max Size: 4KB) for validation. But actual use-case requires SRK table (8 keys) in
header (Size: 10KB).

Total Available OCRAM for SPL image and header:	88KB

Current SPL image size with GCC 5.4.1 tool-chain:	84KB
Current SPL header size with GCC 5.4.1 tool-chain:	4KB

Required SPL header size with GCC 5.4.1 tool-chain:	10KB

So we need to reduce SPL image size by 6KB more.

Sumit