pico-imx7d: README: Drop old instructions about secure mode

[oweals/u-boot.git] / doc / README.rockchip

diff --git a/doc/README.rockchip b/doc/README.rockchip
index da99f301ff702f1939d40f9d46b5df67cecc536f..51b00a9d8505f9cf4d06b1faf8f39229174d0805 100644 (file)
--- a/doc/README.rockchip
+++ b/doc/README.rockchip
@@ -1,9 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
 #
 # Copyright (C) 2015 Google. Inc
 # Written by Simon Glass <sjg@chromium.org>
-#
-# SPDX-License-Identifier:     GPL-2.0+
-#
 
 U-Boot on Rockchip
 ==================
@@ -126,11 +124,11 @@ something like:
    =>
 
 The rockchip bootrom can load and boot an initial spl, then continue to
-load a second-level bootloader(ie. U-BOOT) as soon as it returns to bootrom.
-Therefore RK3288 has another loading sequence like RK3036. The option of
-U-Boot is controlled with this setting in U-Boot:
+load a second-stage bootloader (ie. U-Boot) as soon as the control is returned
+to the bootrom. Both the RK3288 and the RK3036 use this special boot sequence.
+The configuration option enabling this is:
 
-       #define CONFIG_SPL_ROCKCHIP_BACK_TO_BROM
+       CONFIG_SPL_ROCKCHIP_BACK_TO_BROM=y
 
 You can create the image via the following operations:
 
@@ -176,17 +174,17 @@ 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