I want to add support for Keenetic Buddy 4 (KN-3211) to OpenWrt. This router (actually a retransmitter) has a MT76x8 SoC and is similar to already supported KN-1613 Explorer/Air (image for KN-1613 works on KN-3211, with exception for LEDs and buttons).
So when I'm trying to build OpenWrt for this device (here is patch), make outputs the following lines:
board.c:48:2: error: #error "Unsupported SOC..."
48 | #error "Unsupported SOC..."
| ^~~~~
board.c: In function 'board_putc':
board.c:62:25: error: 'UART_LSR' undeclared (first use in this function); did you mean 'UART_LSR_THRE'?
62 | while ((READREG(UART_LSR) & UART_LSR_MASK) == 0);
| ^~~~~~~~
board.c:52:57: note: in definition of macro 'READREG'
52 | #define READREG(r) (*(volatile uint32_t *)(r))
| ^
board.c:62:25: note: each undeclared identifier is reported only once for each function it appears in
62 | while ((READREG(UART_LSR) & UART_LSR_MASK) == 0);
| ^~~~~~~~
board.c:52:57: note: in definition of macro 'READREG'
52 | #define READREG(r) (*(volatile uint32_t *)(r))
| ^
board.c:62:37: error: 'UART_LSR_MASK' undeclared (first use in this function); did you mean 'UART_LSR_THRE'?
62 | while ((READREG(UART_LSR) & UART_LSR_MASK) == 0);
| ^~~~~~~~~~~~~
| UART_LSR_THRE
board.c:63:18: error: 'UART_THR' undeclared (first use in this function); did you mean 'UART_LSR_THRE'?
63 | WRITEREG(UART_THR, ch);
| ^~~~~~~~
board.c:53:49: note: in definition of macro 'WRITEREG'
53 | #define WRITEREG(r,v) (*(volatile uint32_t *)(r)) = v
| ^
make[7]: *** [Makefile:107: board.o] Error 1
make[7]: Leaving directory '/home/lotigara/openwrt/build_dir/target-mipsel_24kc_musl/linux-ramips_mt76x8/tmp/openwrt-ramips-mt76x8-keenetic_kn-3211-initramfs-kernel.bin.src'
make[6]: *** [Makefile:43: loader-compile] Error 2
make[6]: Leaving directory '/home/lotigara/openwrt/target/linux/ramips/image/lzma-loader'
Piece of $HOME/openwrt/build_dir/target-mipsel_24kc_musl/linux-ramips_mt76x8/tmp/openwrt-ramips-mt76x8-keenetic_kn-3211-initramfs-kernel.bin.src/board.c:
#if defined(SOC_MT7620) || defined(SOC_RT3883)
#define UART_BASE KSEG1ADDR(0x10000c00)
#define UART_THR (UART_BASE + 0x04)
#define UART_LSR (UART_BASE + 0x1c)
#define UART_LSR_MASK UART_LSR_TEMT
#elif defined(SOC_MT7621)
#define UART_BASE KSEG1ADDR(0x1e000c00)
#define UART_THR (UART_BASE + 0x00)
#define UART_LSR (UART_BASE + 0x14)
#define UART_LSR_MASK UART_LSR_THRE
#elif defined(SOC_RT305X)
#define UART_BASE KSEG1ADDR(0x10000c00)
#define UART_THR (UART_BASE + 0x04)
#define UART_LSR (UART_BASE + 0x1c)
#define UART_LSR_MASK UART_LSR_THRE
#else
#error "Unsupported SOC..."
#endif
There is no check for SOC_MT76X8 (or SOC_MT7628).
I would appreciate any help!