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nboot的main函数主要如下
main
{
SetupCopySection(pTOC);
MMU_EnableICache();
Port_Init();
Uart_Init();
NF_Init();
pCopyPtr = (BYTE *)LOAD_ADDRESS_PHYSICAL;
((PFN_IMAGE_LAUNCH)(LOAD_ADDRESS_PHYSICAL))(); //跳转去执行eboot代码
}
(#define LOAD_ADDRESS_PHYSICAL 0x30038000)
这个0x3003_8000 是表示物理地址吧.我用的是cpu是三星的2440-a43,内置了64M的SDRAM,关于cpu物理地址的定义如下
; TABLE FORMAT
; cached address, physical address, size
------------------------------------------------------------------------------
g_oalAddressTable
DCD 0x80000000, 0x30000000, 64 ; 32 MB DRAM BANK 6
DCD 0x84000000, 0x10000000, 32 ; nGCS2: PCMCIA/PCCARD
DCD 0x86000000, 0x18000000, 32 ; 32 MB SROM(SRAM/ROM) BANK 3
DCD 0x88000000, 0x20000000, 32 ; 32 MB SROM(SRAM/ROM) BANK 4
DCD 0x8A000000, 0x28000000, 32 ; 32 MB SROM(SRAM/ROM) BANK 5
DCD 0x8C000000, 0x08000000, 32 ; 32 MB SROM(SRAM/ROM) BANK 1
DCD 0x90800000, 0x48000000, 1 ; Memory control register
DCD 0x90900000, 0x49000000, 1 ; USB Host register
DCD 0x90A00000, 0x4A000000, 1 ; Interrupt Control register
DCD 0x90B00000, 0x4B000000, 1 ; DMA control register
DCD 0x90C00000, 0x4C000000, 1 ; Clock & Power register
DCD 0x90D00000, 0x4D000000, 1 ; LCD control register
DCD 0x90E00000, 0x4E000000, 1 ; NAND flash control register
DCD 0x90F00000, 0x4F000000, 1 ; Camera control register
DCD 0x91000000, 0x50000000, 1 ; UART control register
DCD 0x91100000, 0x51000000, 1 ; PWM timer register
DCD 0x91200000, 0x52000000, 1 ; USB device register
DCD 0x91300000, 0x53000000, 1 ; Watchdog Timer register
DCD 0x91400000, 0x54000000, 1 ; IIC control register
DCD 0x91500000, 0x55000000, 1 ; IIS control register
DCD 0x91600000, 0x56000000, 1 ; I/O Port register
DCD 0x91700000, 0x57000000, 1 ; RTC control register
DCD 0x91800000, 0x58000000, 1 ; A/D convert register
DCD 0x91900000, 0x59000000, 1 ; SPI register
DCD 0x91A00000, 0x5A000000, 1 ; SD Interface register
DCD 0x92000000, 0x00000000, 32 ; 32 MB SROM(SRAM/ROM) BANK 0
DCD 0x00000000, 0x00000000, 0 ; end of table
;------------------------------------------------------------------------------
那么是不是说我的板子上的内存是对应BANK6? 但是我在代码里没有找到选择Bank的代码,硬件上就是直接将相应的一个片选地址拉低,就是表示用片内的sdram了. 如果我外接了一个sdram,那么如何确定这个sdram是被分配到了哪一个bank呢?
知道的帮忙解答下了,现在对这个内存似懂非懂的,感觉很压抑啊...
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