Add text that explains how to get into mask ROM mode.
Signed-off-by: Johan Jonker <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
---
Changed V5:
reword
---
doc/board/rockchip/rockchip.rst | 25 +++++++++++++++++++++++--
1 file changed, 23 insertions(+), 2 deletions(-)
diff --git a/doc/board/rockchip/rockchip.rst b/doc/board/rockchip/rockchip.rst
index de2df3046e28..af6c08c46636 100644
--- a/doc/board/rockchip/rockchip.rst
+++ b/doc/board/rockchip/rockchip.rst
@@ -325,6 +325,27 @@ To build rk3588 boards:
make evb-rk3588_defconfig
make CROSS_COMPILE=aarch64-linux-gnu-
+Mask ROM mode
+-------------
+
+Mask ROM mode is the fallback mode of the boot ROM,
+in which it listens for USB commands 0x471/0x472.
+
+Options to get your board into Mask ROM mode:
+
+* Hold the recovery button, depending on firmware support or wiring,
+ while booting the board.
+* Remove any SD cards, removable eMMC or removable UFS modules.
+* Erase any storage media containing boot firmware.
+
+Methods of last resort (USE AT YOUR OWN RISK):
+
+Short the following pins briefly while powering the board, so the boot ROM
+cannot locate any boot firmware and falls back into Mask ROM mode:
+
+* NAND: connect pin 8 and 9 of the NAND flash with a needle.
+* eMMC: connect the clock line to ground.
+
Flashing
--------
@@ -485,9 +506,9 @@ To write a U-Boot image to the SD card (assumed to be
/dev/sda):
NAND
""""
-Bring device in BootROM mode:
+Bring device in Mask ROM mode:
-If bricked and no BootROM mode shows up then connect pin 8 and 9 of the NAND
flash
+If bricked and no Mask ROM mode shows up then connect pin 8 and 9 of the NAND
flash
with a needle while reconnecting to the USB OTG port to a PC.
Show connected devices with:
--
2.39.5
