FreeCalypso > hg > freecalypso-tools
annotate target-utils/libcommon/uartsel.c @ 416:30f6d1c32c6f
doc/Flash-boot-defect article removed (no longer relevant)
This article is no longer relevant because the issue in question
only affected one (1) defective FCDEV3B board which was not
and never will be sold.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 26 Oct 2018 07:11:08 +0000 |
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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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11 |
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12 extern struct ns16550_regs *uart_base; |
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13 |
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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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17 |
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18 uart_select_init() |
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19 { |
35
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20 rom_version = *(const u16 *)0x1FFE; |
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21 |
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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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46 |
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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 } |