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  • Marek Vasut's avatar
    ARM: rmobile: Add recovery SPL for R-Car Gen3 · 5602330d
    Marek Vasut authored
    
    
    Build an SPL which can be started via SCIF download mode on R-Car Gen3
    and allows loading and executing U-Boot uImage with the next stage code.
    This is also useful for starting e.g. ATF BL2, which inits the hardware
    and returns to the U-Boot SPL, which can then load e.g. U-Boot proper.
    
    The H3, M3-W, M3-N SoCs have plenty of SRAM for storing the U-Boot SPL
    while the payload, e.g. ATF BL2, executes, so there is no problem here.
    
    However, E3 and D3 have much less SRAM, hence the loader uses a trick
    where it copies itself beyond the area used by BL2 and executes from
    there. That area is 32kiB large and not enough to hold U-Boot SPL, BSS,
    stack and malloc area, so the later two are placed at +0x4000 offset
    from start of SRAM, another area not used by ATF BL2. To make things
    even more complicated, the SCIF loader cannot load to the upper 32kiB
    of the SRAM directly, hence the copying approach.
    
    Signed-off-by: default avatarMarek Vasut <marek.vasut+renesas@gmail.com>
    Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
    5602330d