ARM: rmobile: Add recovery SPL for R-Car Gen3

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: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/Kconfig b/Kconfig
index 5f5c5ccfd6..7bdb536012 100644
--- a/Kconfig
+++ b/Kconfig
@@ -155,6 +155,7 @@ config SYS_MALLOC_LEN
 config SPL_SYS_MALLOC_F_LEN
 	hex "Size of malloc() pool in SPL before relocation"
 	depends on SYS_MALLOC_F
+	default 0x2800 if RCAR_GEN3
 	default SYS_MALLOC_F_LEN
 	help
 	  Before relocation, memory is very limited on many platforms. Still,