4.104.115
Last change
on this file since 2fbe159e was
2fbe159e,
checked in by Joel Sherrill <joel.sherrill@…>, on 09/19/08 at 15:49:28
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2008-09-19 Joel Sherrill <joel.sherrill@…>
- Makefile.am, startup/bspstart.c: Split out bspstart contents. Move
cache code to libcpu.
- startup/bspgetcpuclockspeed.c: New file.
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-
Property mode set to
100644
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File size:
1.2 KB
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1 | /* |
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2 | * COPYRIGHT (c) 1989-2008. |
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3 | * On-Line Applications Research Corporation (OAR). |
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4 | * |
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5 | * The license and distribution terms for this file may be |
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6 | * found in the file LICENSE in this distribution or at |
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7 | * |
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8 | * http://www.rtems.com/license/LICENSE. |
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9 | * |
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10 | * $Id$ |
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11 | */ |
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12 | |
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13 | #include <bsp.h> |
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14 | |
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15 | /* |
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16 | * Read/write copy of common cache |
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17 | * Split I/D cache |
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18 | * Allow CPUSHL to invalidate a cache line |
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19 | * Enable buffered writes |
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20 | * No burst transfers on non-cacheable accesses |
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21 | * Default cache mode is *disabled* (cache only ACRx areas) |
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22 | */ |
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23 | uint32_t cacr_mode = MCF5XXX_CACR_CENB | MCF5XXX_CACR_DBWE | MCF5XXX_CACR_DCM; |
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24 | |
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25 | /* |
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26 | * Cacheable areas |
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27 | */ |
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28 | extern char RamBase[]; |
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29 | extern char RamSize[]; |
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30 | |
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31 | /* |
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32 | * bsp_start |
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33 | * |
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34 | * This routine does the bulk of the system initialisation. |
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35 | */ |
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36 | void bsp_start( void ) |
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37 | { |
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38 | /* |
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39 | * Invalidate the cache and disable it |
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40 | */ |
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41 | m68k_set_acr0(0); |
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42 | m68k_set_acr1(0); |
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43 | m68k_set_cacr(MCF5XXX_CACR_CINV); |
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44 | |
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45 | /* |
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46 | * Cache SDRAM |
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47 | */ |
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48 | m68k_set_acr0(MCF5XXX_ACR_AB((uintptr_t)RamBase) | |
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49 | MCF5XXX_ACR_AM((uintptr_t)RamSize-1) | |
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50 | MCF5XXX_ACR_EN | |
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51 | MCF5XXX_ACR_BWE | |
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52 | MCF5XXX_ACR_SM_IGNORE); |
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53 | |
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54 | /* |
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55 | * Enable the cache |
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56 | */ |
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57 | m68k_set_cacr(cacr_mode); |
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58 | } |
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