Hello, I am porting u-boot 1.0 to MPC862ADS board with MPC862P processor. The use<br>r manual says the board is compatible with MPC8xxFADS for SW point of view. The b<br>oard has 8M SDRAM and additional 32M EDO DRAM (or 16M) will be inserted.<br>According to the fads.c file, SDRAM is physically mapped at address 0 and DRAM im<br>mediately follows SDRAM, i.e. DRAM is mapped at 0x800000. So the BR2/OR2, BR3/OR3<br> are initialized as follows:<br><br>16 Mbyte DRAM uses only CS2:<br> memctl->memc_or2 = 0xff000800; <br> memctl->memc_br2 = 0x00800081; <br><br>32 Mbyte DRAM uses both CS3 and CS2:<br> memctl->memc_or3 = 0xff000800; <br> memctl->memc_br3 = 0x01800081;<br> memctl->memc_or2 = 0xff000800; <br> memctl->memc_br2 = 0x00800081; <br><br>With these settings, bank 2 is mapped to 0x00000000~0x00ffffff, bank 3 is mapped <br>to 0x01800000~0x01ffffff. This is not the desired mapping. The desired mapping is<br>: 0x00800000~(0x01800000-1) => bank2, 0x01800000~(0x02800000-1) => bank3. But I <br>don't think we can get this mapping by setting BR/OR2 and BR3/OR3 with appropriat<br>e values. So I think DRAM should be mapped at address 0 and SDRAM follows if the <br>DRAM size is 16MB or 32MB. <br><br>Is my understanding correct?<br><br><br><!--临时备份,可以删除>
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