[U-Boot] [PATCH v1 0/4] arm: socfgpa: support of-platdata

[Lukasz Majewski]

Hi Simon,

> This is an initial attempt to support OF_PLATDATA for socfpga gen5.
> 
> There are two motivations for this:
> a) reduce code size to eventually support secure boot (where SPL has
> to authenticate the next stage by loading/checking U-Boot from a FIT
>    image)
> b) to support the cyclone 5 boot ROM's CRC check on the SPL in SRAM
>    (on warm-restart), all bytes to check need to be in one piece. With
>    OF_SEPARATE, this is not the case (.bss is between .rodata and the
>    DTB). Since OF_EMBEDDED has been discouraged, OF_PLATDATA seems to
>    be a good solution.

I'm not an expert with SOCFPGA nor your application, but maybe
selecting: "SPL_SEPARATE_BSS" would fix your issue?

This option allows putting on IMX6 SPL the DTB blob into OCRAM (internal
RAM), before the DDR is setup (so it would be possible to calculate
CRC). 

I've stumbled upon such issue when I wanted to switch from OF_EMBEDDED
to OF_SEPARATE.

> 
> This series enables booting from MMC with OF_PLATDATA. Booting from
> SPI does not yet work (I'm working on that, but it's tougher than
> expected).
> 
> Tested on the socrates board. To use it:
> - use socfpga_socrates_defconfig
> - disable CONFIG_SPL_SPI_FLASH_SUPPORT, CONFIG_SPL_SPI_SUPPORT and
>   CONFIG_SPL_DM_RESET (those don't work yet)
> - enable CONFIG_DESIGNWARE_SERIAL (required for console)
> 
> 
> Simon Goldschmidt (4):
>   arm: socfpga: imply SPL config instead of select
>   arm: socfpga: fix compiling with OF_PLATDATA
>   serial: add an of-platdata driver for "snps,dw-apb-uart"
>   mmc: socfpga: support of-platdata
> 
>  arch/arm/Kconfig               |  4 ++--
>  arch/arm/mach-socfpga/misc.c   |  2 +-
>  drivers/mmc/socfpga_dw_mmc.c   | 28 ++++++++++++++++++++---
>  drivers/serial/Kconfig         | 10 ++++++++
>  drivers/serial/Makefile        |  1 +
>  drivers/serial/serial_dw_apb.c | 42
> ++++++++++++++++++++++++++++++++++ 6 files changed, 81 insertions(+),
> 6 deletions(-) create mode 100644 drivers/serial/serial_dw_apb.c
> 




Best regards,

Lukasz Majewski

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