[PATCH 1/1] doc: expand on JH7110 boot select switches

[Heinrich Schuchardt]

While some boards have separate switch RGPIO0, RGPIO1 others only
have a common switch.

Describe the restriction.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
 doc/board/starfive/jh7110_common.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doc/board/starfive/jh7110_common.rst b/doc/board/starfive/jh7110_common.rst
index 77102fcc189..14ec556ab13 100644
--- a/doc/board/starfive/jh7110_common.rst
+++ b/doc/board/starfive/jh7110_common.rst
@@ -237,6 +237,11 @@ RGPIO1 RGPIO0 StarFive loader function @ 0x2A00_0000
 1      1      UART Serial XMODEM loader
 ====== ====== ======================================
 
+While some boards have separate switches for RGPIO0 and RGPI01 (Milk-V Mars,
+StarFive VisionFive 2, Pine64 Star64) other boards only offer a common
+switch (Orange Pi RV, StarFive VisionFive 2 Lite) or control line
+(Milk-V Mars CM). Here booting from SD-card or eMMC is not possible.
+
 According to `JH-7110 Boot User Guide BootROM`_ the StarFive loader code reads
 content to SRAM @ 0x0800_0000 from different media selected by [RGPIO1,RGPIO0].
 
-- 
2.51.0