...
...
#elif defined(SPI_PINS_CSN9_CE8)
	#define CSN_PORT	PORTB	// port for CSN
	#define CSN_DDR		DDRB	// DDR for CSN
	#define	CSN_PIN		PB1		// Arduino Pin 9 <-> Bit 1 of port B

	#define CE_PORT		PORTB	// port for CE
	#define CE_DDR		DDRB	// DDR for CE
	#define	CE_PIN		PB0		// Arduino Pin  8 <-> Bit 0 of port B
#endif

and

static void initSPI(void) {
	...
        ...
	#elif defined(SPI_PINS_CSN9_CE8)
		// set pin mode: MOSI,SCLK,CE,CSN = OUTPUT, MISO = INPUT (=> all on same port)
		SPI_DDR = _BV(SPI_MOSI) | _BV(SPI_SCLK) | _BV(CE_PIN) | _BV(CSN_PIN) | ~_BV(SPI_MISO);
	#endif

set MOSI,SCLK,CE,CSN to OUTPUT -> SPI_DDR = _BV(SPI_MOSI) | _BV(SPI_SCLK) | _BV(CE_PIN) | _BV(CSN_PIN)
set PB2 to OUTPUT -> | _BV(PB2)
set MISO to INPUT -> | ~_BV(SPI_MISO)
and set CSN to output -> CSN_DDR = _BV(CSN_PIN);

The controller still doesn't recognize the node, so I cannot use OTA. But when I flash the sketch (with the CE and CSN pin defined to 8 and 9) with a programmer to an atmega328p with a standard bootloader it works, so my PCB seems ok.

#elif defined(SPI_PINS_CSN9_CE8)
	// set pin mode: MOSI,SCLK,CE,CSN = OUTPUT, MISO = INPUT
	// PB2 is SS pin has to be defined as OUTPUT, else SPI goes to slave mode
	SPI_DDR = _BV(SPI_MOSI) | _BV(SPI_SCLK) | _BV(CE_PIN)  | _BV(CSN_PIN) | _BV(PB2) | ~_BV(SPI_MISO);
	// set CSN = output
	CSN_DDR = _BV(CSN_PIN);
#endif

Looking to other bootloaders was no success, e.g. optiboot.

Thanks in advance for any hint or better some sample code.

So the code in the HW.hnow looks like this, but I am not sure how to change the initSPI() method:

#elif defined(SPI_PINS_CSN9_CE8)
	#define CSN_PORT	PORTB	// port for CSN
	#define CSN_DDR		DDRB	// DDR for CSN
	#define	CSN_PIN		PB1		// Arduino Pin 9 <-> Bit 1 of port B

	#define CE_PORT		PORTB	// port for CE
	#define CE_DDR		DDRB	// DDR for CE
	#define	CE_PIN		PB0		// Arduino Pin  8 <-> Bit 0 of port B
#endif

static void initSPI(void) {
	// Initialize the SPI pins: SCK, MOSI, CE, CSN as outputs, MISO as input
	#if defined(SPI_PINS_CE9_CSN10)
		// CSN_PIN (=PB2) is SS pin and set as output
		SPI_DDR = _BV(SPI_MOSI) | _BV(SPI_SCLK) | _BV(CE_PIN) | _BV(CSN_PIN);
	#elif defined(SPI_PINS_CSN7_CE8)
		// PB2 is SS pin has to be defined as OUTPUT, else SPI goes to slave mode
		SPI_DDR = _BV(SPI_MOSI) | _BV(SPI_SCLK) | _BV(CE_PIN) | _BV(PB2);	
		CSN_DDR = _BV(CSN_PIN);
	#elif defined(SPI_PINS_CSN9_CE8)
		// set pin mode: MOSI,SCLK,CE,CSN = OUTPUT, MISO = INPUT
		SPI_DDR = _BV(SPI_MOSI) | _BV(SPI_SCLK) | _BV(CE_PIN) | _BV(CSN_PIN) | ~_BV(SPI_MISO);
		// set CSN = output
		CSN_DDR = _BV(CSN_PIN);
	#endif

Is there any further code I have to change?

Thanks in advance for any hint, I am not used to code on that bit level and AVR macros.

My copy's attached. Same pins and rf24 config; but also added five flashes to an LED connected to pin D9, so you can tell when it's in a reboot loop.

Source here: https://github.com/peterdey/MySensors-Arduino/tree/master/MYSBootloader

MYSBootloader.hex

I attached the bootloader for other interested people.

Settings:
CSN pin: 7
CE pin: 8

#define RF24_CHANNEL	   90             //RF channel for the sensor net, 0-127
#define RF24_DATARATE 	   RF24_250KBPS   //RF24_250KBPS for 250kbs, RF24_1MBPS for 1Mbps, or RF24_2MBPS for 2Mbps
#define RF24_PA_LEVEL 	   RF24_PA_MAX    //Sensor PA Level == RF24_PA_MIN=-18dBm, RF24_PA_LOW=-12dBm, RF24_PA_HIGH=-6dBM, and RF24_PA_MAX=0dBm
#define RF24_PA_LEVEL_GW   RF24_PA_LOW  //Gateway PA Level, defaults to Sensor net PA Level.  Tune here if using an amplified nRF2401+ in your gateway.
#define BASE_RADIO_ID 	   ((uint64_t)0xA8A8E1FC00LL) // This is also act as base value for sensor nodeId addresses. Change this (or channel) if you have more than one sensor network.

MYSBootloader.hex