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rockchip: rk3188: use boot0 hook to load up SPL in 2 steps

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For the RK3188, the BROM will attempt to load up the first stage
image (SPL for the RK3188) in two steps: first 1KB to offset 0x800
in the SRAM and then the remainder to offset 0xc00 in the SRAM.
It always enters at 0x804, though.

With this changeset, the RK3188 boot removes the TPL (stub) stage and
builds a single SPL binary that utilizes the early back-to-bootrom via
the boot0-hook.

Consequently, the passing of the saved boot params via pmu->os_reg[2]
is also removed.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
This commit is contained in:
Philipp Tomsich
2017-10-10 16:21:15 +02:00
parent ecfd71891a
commit 4d9253fb76
6 changed files with 9 additions and 112 deletions
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10
doc/README.rockchip
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@@ -176,17 +176,17 @@ described above, but the image creation needs a bit more care.
The bootrom of rk3188 expects to find a small 1kb loader which returns
control to the bootrom, after which it will load the real loader, which
can then be up to 29kb in size and does the regular ddr init.
can then be up to 29kb in size and does the regular ddr init. This is
handled by a single image (built as the SPL stage) that tests whether
it is handled for the first or second time via code executed from the
boot0-hook.
Additionally the rk3188 requires everything the bootrom loads to be
rc4-encrypted. Except for the very first stage the bootrom always reads
and decodes 2kb pages, so files should be sized accordingly.
# copy tpl, pad to 1020 bytes and append spl
cat tpl/u-boot-tpl.bin > tplspl.bin
truncate -s 1020 tplspl.bin
cat spl/u-boot-spl.bin >> tplspl.bin
tools/mkimage -n rk3188 -T rksd -d tplspl.bin out
tools/mkimage -n rk3188 -T rksd -d spl/u-boot-spl.bin out
# truncate, encode and append u-boot.bin
truncate -s %2048 u-boot.bin