Fábio Coutada
62e8454f91
- make-uefi-iso.sh: UEFI ISO image builder - test_boot.S, test_boot.ld: test boot assembly and linker script - eim_config.toml: EIM (External Interface Module) configuration - edk2-ovmf RPM for UEFI firmware - GAP_ANALYSIS_PIKEOS_PARITY.md: PikeOS parity gap analysis
26 lines
717 B
C
26 lines
717 B
C
/* Minimal ESP32 UART test — no kernel, just UART output */
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#include <stdint.h>
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/* ESP32 UART0 (QEMU uses 0x3FF40000) */
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#define UART0_DR (*(volatile uint32_t*)0x3FF40000)
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#define UART0_CLKDIV (*(volatile uint32_t*)0x3FF4001C)
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#define UART0_CONF0 (*(volatile uint32_t*)0x3FF40020)
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static void uart_putc(char c) {
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UART0_DR = c;
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}
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static void uart_puts(const char* s) {
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while (*s) uart_putc(*s++);
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}
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void _start(void) {
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/* Init UART */
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UART0_CLKDIV = 43; /* 80MHz / 16 / 115200 ≈ 43 */
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UART0_CONF0 = (1u << 16) | (1u << 18) | (0x3 << 1); /* FIFO+TX+8N1 */
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uart_puts("Xtensa UART OK\n");
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for (volatile int i = 0; i < 1000000; i++);
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uart_puts("Done\n");
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for (;;);
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}
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