+
−/*
+
− * uart_select_init() figures out which UART was used to load us
+
− * through the boot ROM, and sets things up for us to use the same
+
− * UART for our communication.
+
− */
+
−
+
−#include "types.h"
+
−#include "romvars.h"
+
−#include "ns16550.h"
+
−#include "halt.h"
+
−
+
−extern struct ns16550_regs *uart_base;
+
−
+
−static u16 rom_version;
+
−static struct boot_rom_vars *rom_vars;
+
−static char *uart_name;
+
−
+
−uart_select_init()
+
−{
+
−	rom_version = *(const u16 *)0x1FFE;
+
−
+
−	switch (rom_version) {
+
−	case 0x0200:
+
−		rom_vars = (struct boot_rom_vars *) 0x800504;
+
−		break;
+
−	case 0x0300:
+
−		rom_vars = (struct boot_rom_vars *) 0x800518;
+
−		break;
+
−	default:
+
−		_exit(HALTCODE_BOOTROMVER);
+
−	}
+
−
+
−	switch (rom_vars->uart_id) {
+
−	case 0:
+
−		uart_base = (struct ns16550_regs *) 0xFFFF5800;
+
−		uart_name = "MODEM";
+
−		break;
+
−	case 1:
+
−		uart_base = (struct ns16550_regs *) 0xFFFF5000;
+
−		uart_name = "IrDA";
+
−		break;
+
−	default:
+
−		_exit(HALTCODE_INVALIDUART);
+
−	}
+
−}
+
−
+
−print_boot_rom_info()
+
−{
+
−	printf("Loaded via boot ROM v%04X, UART %d (%s) at baud rate #%d\n",
+
−		rom_version, rom_vars->uart_id, uart_name,
+
−		rom_vars->baud_rate_code);
+
−	printf("CLKTCXO input autodetected to be %d MHz\n",
+
−		rom_vars->clktcxo_13mhz ? 13 : 26);
+
−}