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可以
- }* }8 w5 c) }* P4 K不过这个通常是需要看MCU的手册的，按照MCU手册上面的关于MEM CLOCK这部分1 X3 [7 B- y5 n1 }
! C8 I& n6 | j: X k+ ^$ r
通常在系统启动的时候进行寄存器部分的设置拿三星的2410来说3 H- D# d3 K7 B
AREA Init,CODE,READONLY
- Y" D& X& }3 n' M* Z; X% D ENTRY # k C+ l2 L5 N7 r' B/ b9 t
b HandlerUndef ;handler for Undefined mode
1 i' J D6 t6 \* r' E b HandlerSWI ;handler for SWI interrupt4 I" U$ ^- B+ v- @5 t: t7 X2 O& h7 O
b HandlerPabort ;handler for PAbort
7 ?4 l6 \; b& q+ l8 g) z- x( b b HandlerDabort ;handler for DAbort2 T2 \( _/ h: d# e' _
b . ;reserved6 e z3 X; q2 t. J6 Q
b HandlerIRQ ;handler for IRQ interrupt * o, J, v% G, R9 z! ?+ Y0 m3 C, m: l
b HandlerFIQ ;handler for FIQ interrupt
+ ~9 e, N' E' Q8 D2 V4 n/ P4 h5 {初始化中断向量表。。。。
( C; c2 X, z6 b4 x0 I7 w8 b在初始化堆栈前必须做外部SDRAM内存的硬件初始化，这个时候就会根据硬件手册设置好相应的- A/ \9 e* ~% G* W
....................( R( I5 D5 a1 C7 c
;Set memory control registers
8 ~' H+ F% n2 q" @ ldr r0,=SMRDATA2 X2 ]! G2 m" y
ldr r1,=BWSCON ;BWSCON Address
/ o+ ^ a( q# Y add r2, r0, #52 ;End address of SMRDATA
! I. X; i2 c1 Q9 j4 }% h.................
& d8 @. q: s* d! w;@0x20$ O, o" Q, K+ C4 s
b EnterPWDN
& T, y% k/ m% y( N) gSMRDATA DATA
% Z; u0 W; ^( R8 @' d+ ?" W1 x0 a) x; Memory configuration should be optimized for best performance
9 Z. z3 M& s$ ~; The following parameter is not optimized.
h- ~0 M* T5 g1 t9 [$ `; Memory access cycle parameter strategy _5 F. y, [# l' q$ A3 E
; 1) The memory settings is safe parameters even at HCLK=75Mhz.
% `" x' d9 Z3 t+ z" V3 c2 w6 b; 2) SDRAM refresh period is for HCLK=75Mhz.
: V4 s u) i1 u* s8 j4 Y( B( j# I7 E
DCD (0+(B1_BWSCON<<4)+(B2_BWSCON<<8)+(B3_BWSCON<<12)+(B4_BWSCON<<16)+(B5_BWSCON<<20)+(B6_BWSCON<<24)+(B7_BWSCON<<28))
# Y7 X& o3 K7 y5 G M8 n& ? DCD ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC)) ;GCS07 N: ^2 l: |. E) j9 R0 q
DCD ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC)) ;GCS1
- F9 z. H& e. N% S4 P DCD ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC)) ;GCS2
$ m" ?- ?& {+ J; z DCD ((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC)) ;GCS3) d$ D/ p7 _: P# T( {8 H
DCD ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC)) ;GCS4
+ Q$ Z$ F. t1 u5 V DCD ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC)) ;GCS5
4 }0 |8 j, T l* {6 s( P5 Y g" x DCD ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN)) ;GCS6. J4 C: {- `0 x) l5 L
DCD ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN)) ;GCS7* ^/ r( L S g) m `" Z( M8 \( ?
; DCD ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT) ;Tchr not used bit
2 b: L6 g( ~6 S4 [0 x DCD ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+REFCNT) 2 D, p" v3 L* @
$ `+ {. \4 N9 ?- T: C" z
G( w6 @( j8 P% W) J' |* [& f4 C
9 l6 w% ^: S5 V: U3 I
; DCD 0x32 ;SCLK power saving mode, ARM core burst disable, BANKSIZE 128M/128M% F7 h; E: K$ l- Q5 K* c* p
DCD 0xb2 ;SCLK power saving mode, ARM core burst enable , BANKSIZE 128M/128M - 11/29/2002
v0 T! p4 K4 b4 Y' P4 u
* G- b5 \) @8 x z8 R; }4 J: r DCD 0x30 ;MRSR6 CL=3clk
- f! E! i8 _: }0 \2 ? DCD 0x30 ;MRSR7, f) }1 M! Y! u, Q( a
; DCD 0x20 ;MRSR6 CL=2clk1 o+ B8 n3 l ^$ W1 k3 e
; DCD 0x20 ;MRSR7 |
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发表于 2009-7-6 10:21
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