775a02cf3f
Bring up minos on the Allwinner D1 (Lichee RV) over FEL/xfel and add bidirectional UART so the console can read keystrokes, not just print. D1 / Lichee RV boot: - riscv arch.c: select UART0 base by -DBOARD_D1 (0x02500000 vs QEMU 0x10000000) and add a reg-shift abstraction (uart_rd/uart_wr): the D1's Synopsys DW-8250 uses 32-bit registers at 4-byte spacing, which is what made the first hardware boot silent. - d1_uart0_init(): gate/deassert UART0 clock, mux PB8/PB9 to UART0, set 115200 8N1, clear FIFOs, force non-loopback, drain stale RX. - link-d1.ld: link for DRAM at 0x40000000 (xfel exec target, M-mode). - Makefile: 'lichee' builds the flat binary; 'run-lichee' loads it via xfel (ddr d1 / write / exec). - arch_name() reports the concrete board. UART input (all archs): - arch contract gains arch_uart_getc() and arch_uart_rx_ready(), implemented for riscv, x86 (COM1) and arm (Cadence UART). - console gains getc() and drain_rx(). - kmain() runs an interactive echo loop (seed of the M3 console). Verified: echo works under QEMU on x86/riscv/arm, and on real D1 hardware (banner once, then live keystroke echo over UART0 @115200).
42 lines
976 B
C
42 lines
976 B
C
/* console.c — portable text output built on arch_uart_putc().
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* No libc: we implement the tiny bit of formatting we need. */
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#include "arch.h"
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#include "console.h"
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void putc(char c)
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{
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if (c == '\n')
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arch_uart_putc('\r'); /* CRLF for dumb terminals */
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arch_uart_putc(c);
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}
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void puts(const char *s)
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{
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while (*s)
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putc(*s++);
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}
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/* Read one byte from the UART. Portable wrapper over arch_uart_getc(). */
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char getc(void)
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{
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return arch_uart_getc();
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}
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/* Discard any bytes currently waiting in the RX FIFO. Used to drop the
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* bytes our own TX echoes back on half-duplex-wired boards before we start
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* reading real keystrokes. */
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void drain_rx(void)
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{
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while (arch_uart_rx_ready())
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(void)arch_uart_getc();
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}
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/* Minimal unsigned hex printer — enough to show addresses/registers. */
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void puthex(unsigned long v)
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{
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static const char d[] = "0123456789abcdef";
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int i;
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puts("0x");
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for (i = (int)(sizeof(v) * 2) - 1; i >= 0; i--)
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putc(d[(v >> (i * 4)) & 0xf]);
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}
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