[U-Boot] [PATCH] am335x_hs_evm: Trim options in SPL to reduce binary size

[Andrew F. Davis <afd@ti.com>]

On 12/16/2017 10:04 PM, Tom Rini wrote:
> The am335x_hs_evm runs into size constraint problems at times with
> various toolchains as changes come in due to the config have a large
> number of options in SPL (to showcase what is possible) while also
> having rather constrained binary limits.  Gain some of this room back by
> lowering the loglevel, disabling HW partition support and switching over
> to the tiny FIT image support.
> 
> Cc: Andrew F. Davis <afd@ti.com>
> Signed-off-by: Tom Rini <trini@konsulko.com>
> ---
> I'd really appreciate a run-time test of this patch if at all possible
> as I'm a little worried about TINY_FIT being incompatible with all of
> the security options.  Thanks!
> ---
>  configs/am335x_hs_evm_defconfig | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/configs/am335x_hs_evm_defconfig b/configs/am335x_hs_evm_defconfig
> index 48b0e8583997..8eb304686dc7 100644
> --- a/configs/am335x_hs_evm_defconfig
> +++ b/configs/am335x_hs_evm_defconfig
> @@ -13,10 +13,12 @@ CONFIG_ANDROID_BOOT_IMAGE=y
>  CONFIG_FIT_IMAGE_POST_PROCESS=y
>  CONFIG_SPL_LOAD_FIT=y
>  CONFIG_SPL_FIT_IMAGE_POST_PROCESS=y
> +CONFIG_LOGLEVEL=3
>  CONFIG_SYS_CONSOLE_INFO_QUIET=y
>  CONFIG_VERSION_VARIABLE=y
>  CONFIG_ARCH_MISC_INIT=y
>  CONFIG_SPL=y
> +CONFIG_SPL_FIT_IMAGE_TINY=y
>  # CONFIG_SPL_ENV_SUPPORT is not set
>  # CONFIG_SPL_EXT_SUPPORT is not set
>  CONFIG_SPL_MTD_SUPPORT=y
> @@ -37,6 +39,7 @@ CONFIG_DFU_RAM=y
>  CONFIG_DM_I2C=y
>  CONFIG_MISC=y
>  CONFIG_DM_MMC=y
> +# CONFIG_MMC_HW_PARTITIONING is not set

I haven't gotten around to testing the FIT_IMAGE_TINY stuff yet, but
conceptually I have a much bigger problem with this part.

Sacrificing functionality to allow continued SPL bloat is just wrong.

Whatever caused SPL to grow should be re-worked or the author should
have also made some optimization elsewhere to offset this. Now I'll have
to go hunt for more optimizations somewhere so I can get all my features
back here :(

>  CONFIG_MMC_OMAP_HS=y
>  CONFIG_NAND=y
>  CONFIG_NAND_OMAP_GPMC_PREFETCH=y
> @@ -61,5 +64,6 @@ CONFIG_USB_GADGET_VENDOR_NUM=0x0451
>  CONFIG_USB_GADGET_PRODUCT_NUM=0xd022
>  CONFIG_USB_GADGET_DOWNLOAD=y
>  CONFIG_USB_ETHER=y
> +CONFIG_SPL_TINY_MEMSET=y
>  CONFIG_RSA=y
>  CONFIG_LZO=y
>