[PATCH 1/3] imx: imx8mm_beacon: Eliminate a few extras to free up SPL space

[Adam Ford]

On Mon, Oct 24, 2022 at 2:57 PM Tim Harvey <tharvey at gateworks.com> wrote:
>
> On Sat, Oct 22, 2022 at 7:28 AM Adam Ford <aford173 at gmail.com> wrote:
> >
> > There are a few functions which are not essential for use in
> > SPL, but they take up enough space to make other preferred
> > features not fit.  Remove the extras.
> >
> > Signed-off-by: Adam Ford <aford173 at gmail.com>
> >
> > diff --git a/board/beacon/imx8mm/spl.c b/board/beacon/imx8mm/spl.c
> > index a93cc93878..b0e9d918da 100644
> > --- a/board/beacon/imx8mm/spl.c
> > +++ b/board/beacon/imx8mm/spl.c
> > @@ -44,11 +44,6 @@ static void spl_dram_init(void)
> >         ddr_init(&dram_timing);
> >  }
> >
> > -void spl_board_init(void)
> > -{
> > -       debug("Normal Boot\n");
> > -}
> > -
> >  #ifdef CONFIG_SPL_LOAD_FIT
> >  int board_fit_config_name_match(const char *name)
> >  {
> > diff --git a/configs/imx8mm_beacon_defconfig b/configs/imx8mm_beacon_defconfig
> > index e37ce01c19..f6a1012d8a 100644
> > --- a/configs/imx8mm_beacon_defconfig
> > +++ b/configs/imx8mm_beacon_defconfig
> > @@ -29,7 +29,6 @@ CONFIG_DEFAULT_FDT_FILE="imx8mm-beacon-kit.dtb"
> >  CONFIG_SPL_HAS_BSS_LINKER_SECTION=y
> >  CONFIG_SPL_BSS_START_ADDR=0x910000
> >  CONFIG_SPL_BSS_MAX_SIZE=0x2000
> > -CONFIG_SPL_BOARD_INIT=y
> >  # CONFIG_SPL_SHARES_INIT_SP_ADDR is not set
> >  CONFIG_SPL_STACK=0x920000
> >  CONFIG_SYS_SPL_MALLOC=y
> > @@ -88,12 +87,9 @@ CONFIG_DM_PCA953X=y
> >  CONFIG_DM_I2C=y
> >  CONFIG_SUPPORT_EMMC_BOOT=y
> >  CONFIG_MMC_IO_VOLTAGE=y
> > -CONFIG_SPL_MMC_IO_VOLTAGE=y
> >  CONFIG_MMC_UHS_SUPPORT=y
> > -CONFIG_SPL_MMC_UHS_SUPPORT=y
> >  CONFIG_MMC_HS400_ES_SUPPORT=y
> >  CONFIG_MMC_HS400_SUPPORT=y
> > -CONFIG_SPL_MMC_HS400_SUPPORT=y
> >  CONFIG_FSL_USDHC=y
> >  CONFIG_MTD=y
> >  CONFIG_DM_MTD=y
> > @@ -113,14 +109,12 @@ CONFIG_PINCTRL_IMX8M=y
> >  CONFIG_POWER_DOMAIN=y
> >  CONFIG_IMX8M_POWER_DOMAIN=y
> >  CONFIG_DM_PMIC=y
> > +# CONFIG_SPL_PMIC_CHILDREN is not set
> >  CONFIG_DM_PMIC_BD71837=y
> >  CONFIG_SPL_DM_PMIC_BD71837=y
> >  CONFIG_DM_REGULATOR=y
> > -CONFIG_SPL_DM_REGULATOR=y
> >  CONFIG_DM_REGULATOR_BD71837=y
> > -CONFIG_SPL_DM_REGULATOR_BD71837=y
> >  CONFIG_DM_REGULATOR_FIXED=y
> > -CONFIG_SPL_DM_REGULATOR_FIXED=y
> >  CONFIG_DM_REGULATOR_GPIO=y
> >  CONFIG_DM_SERIAL=y
> >  CONFIG_MXC_UART=y
> > --
> > 2.34.1
> >
>
> Adam,
>
> I'm looking at your patches as I'm also trying to strip down the
> imx8mm-venice SPL so that I can fit DM USB support. It seems that
> all/most of the imx8m boards have a spl_board_init() which calls
> arch_misc_init(). I'm curious why your not calling that function?

As of right now, we're not using the CAAM which is initialized in
arch_misc_init.  If/When we do, we'll likely have to pull that in.

>
> Another config that I've found to save a lot of space for imx8m
> without any negative impact I can see is CONFIG_SPL_MMC_TINY=y

I experimented a bit with that too, but I hadn't fully tested
switching between booting between MMC1 and MMC2, so I wasn't quite
ready to enable it, but I'll spend some more time with it to see how
much more space I can shave off SPL.
Getting rid of the PMIC children in SPL helped me quite a bit.

thanks!

adam

>
> Best Regards,
>
> Tim