[PATCH v3 07/12] rockchip: doc: add boot medium layout text

[Johan Jonker <jbx6244@gmail.com>]

Add text that explains the boot medium layout options.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
---

Changed V3:
wrap
remove 'the'
use eMMC
add unit and block size
---
 doc/board/rockchip/rockchip.rst | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/doc/board/rockchip/rockchip.rst b/doc/board/rockchip/rockchip.rst
index c089419b65e5..6b9007103257 100644
--- a/doc/board/rockchip/rockchip.rst
+++ b/doc/board/rockchip/rockchip.rst
@@ -353,6 +353,32 @@ To build rk3588 boards:
         make evb-rk3588_defconfig
         make CROSS_COMPILE=aarch64-linux-gnu-

+Boot media layout
+-----------------
+
+The boot ROM only checks a boot medium for a limited number of pages or blocks
+for data. It is not possible to place these blocks randomly.
+
+* eMMC/SD card:
+
+  Rockchip uses a unified GPT partition layout for it's open source products.
+  With this GPT partition layout U-Boot can be compatible with other components,
+  like miniloader, trusted-os, arm-trusted-firmware.
+
+  There are some documents about partitions in the link below.
+  https://web.archive.org/web/20260501050119/https://opensource.rock-chips.com/wiki_Partitions
+
+  Write u-boot-rockchip.bin to block offset 64 (block size: 512 byte).
+
+* SPI:
+
+  Write u-boot-rockchip-spi.bin to flash offset 0 (unit: bytes).
+
+* NAND:
+
+  The closed source usbplug binaries and RKMTD use the NAND erase blocks [2-6]
+  for TPL/SPL.
+
 BootROM mode
 ------------

--
2.39.5