RZ-G/Boards/HiHope

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HiHope RZ/G2M,N,H board

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The same board is used for RZ/G2M, RZ/G2N and RZ/G2H

Enable I2C-0 on header

Directions on adding I2C-0

You need two nodes in the device tree – one in the ‘pfc’ section to configure pin muxing, and another node at the global level to enable to interface. This is what was added under the ‘pfc’ section –

i2c0_pins: i2c0 { 
    groups = "i2c0";  
    function = "i2c2"; 
};

And this is at the global level –

&i2c0 {  
    pinctrl-0 = <&i2c0_pins>; 
    pinctrl-names = "default"; 
    status = "okay"; 
    clock-frequency = <400000>; 
}; 

You can change the clock frequency to 100000 if you like. I haven’t found a good method for building the device tree using just Yocto commands. So, this is the method that I use –

1. Run this bitbake command -

bitbake -c devshell linux-renesas  

2. This will open a new window. In the new window, run –

make dtbs 
exit  

The generated device tree binaries are in this folder –

build/tmp/work/hihope_rzg2m-poky-linux/linux-renesas/4.19.56-cip5+gitAUTOINC+5b7dee96a2-r1/linux-hihope_rzg2m-standard-build/arch/arm64/boot/dts/renesas 

Note that this is in a different folder tree (build/tmp/work) from the device tree source files (buid/tmp/work-shared). Also, the filenames are a little different, e.g. ‘r8a774a1-hihope-rzg2m-ex.dtb’. So, you need to rename that to ‘Image-r8a774a1-hihope-rzg2m-ex.dtb’ before transferring it to the board.

"No Boot" Message

When you get the message:

No Boot
0x00000010 0x60018118 0x00000008 

If the prohibition setting is made in the Boot Mode setting, it will be in No Boot state.
On the HiHope-RZG2M board, the same error occurs when the following DIP SW settings are made. 0x60018118 indicates the value of MODEMR.

MD8 MD7 MD6 MD5 MD4 MD3 MD2 MD1 MD0
 1   0   0   0   1   1   0   0   0

Since MD5=0 is prohibited, it must be changed to MD5=1.
For eMMC Boot operation, it is necessary to change to MD1=1.