FreeCalypso > hg > freecalypso-tools

annotate target-utils/libcommon/uartsel.c @ 926:6a0aa8d36d06

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rvinterf backslash escape: introduce libprint The new helper function library named libprint is meant to replace the badly misnamed libg23, and will soon contain functions for printing all of the same kinds of GPF TST packets that are now handled in libg23. However, we are also moving safe_print_trace() from libasync to this new library, and changing it to emit our new backslash escape format.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 23 May 2023 03:47:46 +0000
parents 2942c5ef76ed
children
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1 /*
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2 * uart_select_init() figures out which UART was used to load us
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3 * through the boot ROM, and sets things up for us to use the same
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4 * UART for our communication.
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5 */
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6
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7 #include "types.h"
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8 #include "romvars.h"
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9 #include "ns16550.h"
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10 #include "halt.h"
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12 extern struct ns16550_regs *uart_base;
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14 static u16 rom_version;
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15 static struct boot_rom_vars *rom_vars;
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16 static char *uart_name;
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18 uart_select_init()
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19 {
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20 rom_version = *(const u16 *)0x1FFE;
0
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22 switch (rom_version) {
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23 case 0x0200:
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24 rom_vars = (struct boot_rom_vars *) 0x800504;
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25 break;
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26 case 0x0300:
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27 rom_vars = (struct boot_rom_vars *) 0x800518;
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28 break;
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29 default:
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30 _exit(HALTCODE_BOOTROMVER);
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31 }
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32
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33 switch (rom_vars->uart_id) {
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34 case 0:
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35 uart_base = (struct ns16550_regs *) 0xFFFF5800;
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36 uart_name = "MODEM";
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37 break;
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38 case 1:
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39 uart_base = (struct ns16550_regs *) 0xFFFF5000;
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40 uart_name = "IrDA";
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41 break;
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42 default:
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43 _exit(HALTCODE_INVALIDUART);
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44 }
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45 }
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47 print_boot_rom_info()
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48 {
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49 printf("Loaded via boot ROM v%04X, UART %d (%s) at baud rate #%d\n",
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50 rom_version, rom_vars->uart_id, uart_name,
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51 rom_vars->baud_rate_code);
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52 printf("CLKTCXO input autodetected to be %d MHz\n",
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53 rom_vars->clktcxo_13mhz ? 13 : 26);
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54 }