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unicorn06 发表于 2017-4-21 14:34
) S' s' D( u2 [# _* |6 d& E! B7 S,高手~~~
- {9 P+ J9 Z0 i: z4 `# ~9 L正想和你们说这个事呢,我还买了一块c6748的核心板,实在没办法了,我就把c6748核心 ... ) C9 X; i3 E/ c: e) M& F
在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
$ \2 d: u+ @$ Q v/* 重新配置程序入口点 */
: ~8 B# v' b, t2 e9 `-e Entry- /****************************************************************************/9 ?1 u$ v- |* D" n
- /* */
# I" H) A( _+ N: ], d" _; F# j8 n - /* OMAPL138 及 DSP C6748 内存空间分配定义 */. d: l9 R$ K) e$ J1 w b6 P: s
- /* */" K6 y' K8 O2 U% U
- /* 2015年04月20日 */3 `( j; O1 O+ U3 z, \/ g
- /* */
; b% Z" I; U! @, l& ?; @ - /****************************************************************************/
. `" n0 `$ A# z( J" ]: D - /* 堆栈 */
6 d- [* B m* {; D - -stack 0x8000- g, R2 @% o" ?+ w, ?
- -heap 0x2000
% |/ t! E7 I3 i! k- y - . T. b2 a/ F- V. k8 C2 B
- /* 重新配置程序入口点 */6 j/ y4 |0 U. W' L4 Y
- -e Entry
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- MEMORY, H3 ]7 [4 t; e/ k$ v
- {
" d! T: k J* g% D7 K$ p% G - #ifdef DSP_CORE, a5 t4 S2 H6 `
- /****************************************************************************/* S; s6 i7 K6 m0 y3 [" k. F
- /* */
4 L/ [$ B, E7 ?( s, ^' R. V - /* DSP 专有内存区域 */* r$ C& V) _) f( f! D
- /* */" b8 }4 g6 {1 m8 {" Z# Z/ E4 A4 H
- /****************************************************************************/ @5 }9 [/ |4 Q5 f9 H& g0 X6 `7 j
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */% g: n' D t" a" P S2 |
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
+ {, m. L5 w7 C; n - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
- C' i) q/ q% ?; E2 |/ Y( | - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
: o- A1 m8 g; I: H. U - #endif
复制代码 这是一段汇编代码用于切换到特权模式! {! d2 H# [7 e( s/ h/ O
7 ~$ S& W+ P# B* y- X7 `) pOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm, Z( W( |5 r4 G, p8 n
- ;******************************************************************************
" l9 D5 p# E7 e, B3 N4 y3 T - ;
6 s" K \3 S, T9 y - ; init.asm - Init code routines
1 }# M1 u" Q; c/ ?: p - ;
5 I7 Y: x5 Z# K2 [* A - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/8 j8 M9 D5 _" z, B& r3 x3 x/ L; G
- ; All rights reserved.2 q! m1 d+ y; ^2 K4 b( V! h# J
- ;8 w: a; ]% K8 ]) e2 M% c
- ;******************************************************************************
+ i3 {# L/ n" K# Y" S9 }3 k - ;****************************** Global Symbols*******************************, H% t1 n: Q( ]2 ~3 X* c- N
- .global Entry! n0 X$ ]5 [4 g U; E
- .global start_boot
2 |" [# [- u) }) G: | - .global __TI_auto_init
" O3 M& ?! e7 ?* }
% n I5 @3 f- w9 L% K1 n( M+ C% ]- .ref __stack
2 x! T/ f4 @- L: Q; E5 O - .ref __STACK_END
" n" }' D! C Y6 t3 R$ A; _ - .ref bss_start; m7 T U' I* h0 j; ~4 e+ X8 C
- .ref bss_end
6 I! {& [/ U! p- Q: o& P$ Y2 m - .ref start_boot
$ X% ]# |. q1 ?4 | - # x) [: A8 p0 e" x( V
- ;************************ Internal Definitions ******************************
, X+ @6 ^5 B0 a0 l2 U8 S$ I F - ;! m1 @2 P* \8 f: Q( J" Y3 L" q
- ; Define the stack sizes for different modes. The user/system mode will use' O$ E2 A' C. w8 _" S1 t
- ; the rest of the total stack size
# g2 |- g: ?* C' [0 L - ;
. H6 u H- ?( {# `
/ Y+ Q5 U# _ ~+ M* p( @, R- UND_STACK_SIZE .set 0x8
/ S) J/ s# g% b4 {& K0 f - ABT_STACK_SIZE .set 0x8: a% c7 R: r* c6 w( x' Q
- FIQ_STACK_SIZE .set 0x8
" e: t* Y! ~0 b1 _9 L( h$ H6 Y - IRQ_STACK_SIZE .set 0x500( I' l! N0 e0 ~' ^
- SVC_STACK_SIZE .set 0x8
- ~- `/ e- r/ R D
7 {, x* T. ?# T6 ^- ;; |& Y9 i! O' Y' ~' s
- ; to set the mode bits in CPSR for different modes5 H" \* ?. S+ d
- ;
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* I. ?* F. ]; Q5 J8 Q% I- MODE_USR .set 0x10
7 k; w0 {9 e2 Y' y" s1 o - MODE_FIQ .set 0x11$ }6 ]& L* W0 d$ a7 [
- MODE_IRQ .set 0x125 Z @! O+ M6 ~+ O
- MODE_SVC .set 0x13( B9 W& d+ B$ u s' J: Z" o% @
- MODE_ABT .set 0x17
* t# W- ^4 A% C5 A G - MODE_UND .set 0x1B
3 |/ x C* N p6 x* C3 u& |3 i. w - MODE_SYS .set 0x1F
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( b2 W3 }) C _' x' g- I_F_BIT .set 0xC0* J! p% \& W r6 M: k4 k ]* O
/ v1 _9 Q0 j7 N/ M" ]: N: U- ;**************************** Code Seection ***********************************
8 u4 h' h# b! q# y, K - .text
- D3 |8 e2 W! R1 X% X6 x1 @ Q - * Q" S6 y! ]4 M+ [5 T
- ;* {% q" u1 |! U4 T) I
- ; This code is assembled for ARM instructions
7 f! F0 {; U% L6 a2 ~$ H4 f e - ;
+ z8 Y R; z5 |& s. x, F - .state324 U. {% t* m- m8 @0 W) f# f
2 j" s3 j, }" P3 _! G- ;******************************************************************************
# k. h! o! J' j3 [: O5 D - ;' c" P; q* Z4 m2 o! W+ y7 R
- ;******************************************************************************3 g% R) _, U2 V) O( l) }
- ;3 ?' y5 t# A! d$ ^, @" @2 c
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and
. L3 J; j/ a, |8 A$ @; F - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the. P: c: h2 w4 s; ^# z. D" h
- ; main() function.8 e3 @# G p# o* J& f' s$ w
- ;
! E4 `5 r; u1 r/ A$ z - Entry:# N1 {/ F6 D! O( j
- ;
$ X. U# ~0 ~0 F - ; Set up the Stack for Undefined mode
& [1 @; o0 q# C6 c7 T6 R+ A - ;: M* _. z7 n+ f3 ^. N
- LDR r0, _stackptr ; Read and align the stack pointer
2 i, p: N+ P- g r' X) l3 ]! L - SUB r0, r0, #83 W5 _9 e3 _' J) W* N1 c# \6 u
- BIC r0, r0, #7) m4 m4 k1 z" q3 J, I
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode
' C' { J( C! h: A; q - MOV sp,r0 ; write the stack pointer
8 q* S& S: n# k+ a' @. F - SUB r0, r0, #UND_STACK_SIZE ; give stack space5 n: V* b+ Z0 i/ t# I
- ;
( R N E3 F1 P2 A - ; Set up the Stack for abort mode- I; N# V: {' F9 |( f9 A+ V+ @
- ;- W1 e( s+ D# T
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
" N* K7 h2 h' w - MOV sp, r0 ; write the stack pointer
, Q9 ? I \$ e) i# ~+ ], X+ O - SUB r0,r0, #ABT_STACK_SIZE ; give stack space
/ i1 `2 M' k* _3 ^ - ;
0 l; w" l: Y/ l( `$ Z$ P: q6 t6 d# ~0 q! @ - ; Set up the Stack for FIQ mode$ B$ r/ [+ [- m
- ;5 r7 P" J% R- r' Z6 B% Q* H
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode) S& o3 Y S; W N/ L& _# J1 I
- MOV sp,r0 ; write the stack pointer
) V2 B- G' v" U9 d, h# n - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space! l7 P- ~6 N( ]3 F3 l* y
- ;+ W/ [1 I- }( k' ~/ W ~
- ; Set up the Stack for IRQ mode
|7 a8 {0 m, I f6 c0 }0 U: w - ;9 \1 H, i( l) f( {6 w4 n5 Q# @& |
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode8 I: Y$ X. l4 C7 B, @9 T- E
- MOV sp,r0 ; write the stack pointer
8 V0 ?* S$ R" K3 Y R3 a - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
" g# d4 \" H0 r7 }3 [ - ;
/ o9 |6 _1 E/ V: d - ; Set up the Stack for SVC mode9 |5 A* J/ I0 S2 H& m, |" b. N
- ;
) P5 E8 E, t* w$ _: c - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode$ \# M4 S- k0 E5 N
- MOV sp,r0 ; write the stack pointer ?& T" i% B! k6 \
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space5 i6 i- v6 I3 r: F0 a: B& E
- ;
" ` E0 i! O/ m% s" S' k. Q0 ~ - ; Set up the Stack for USer/System mode% z5 j; V* o; s5 x6 b; _# b3 f8 a
- ;
) \5 [' E) v6 d& z3 P! Y1 T - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode4 B+ E4 M3 |7 Y
- MOV sp,r0 ; write the stack pointer7 Y8 {! p& V# S! d3 J
0 } v& W2 Y7 `8 ^' i0 |- ;
% G: |/ [+ `& `+ B( P - ; Clear the BSS section here
# |- r9 z6 h) i: l3 n, C! M - ;" F7 v5 S7 S$ Q1 c4 J
- Clear_Bss_Section:% m6 i+ U( r6 L# t
5 i. z h2 a7 F \! \* x) e- LDR r0, _bss_start ; Start address of BSS
" i% `4 U2 o% ]. o; y - LDR r1, _bss_end ; End address of BSS% C1 ~/ U/ C4 t+ W9 |& K
- SUB r1,r1,#4' ]. H& i' f% Z3 o. o
- MOV r2, #01 W2 a; y! [2 e( S: }
- Loop:
, q1 M) K+ r/ M - STR r2, [r0], #4 ; Clear one word in BSS
8 R7 b: h+ r6 q1 y1 X - CMP r0, r1
* p4 K8 M5 o% S2 H - BLE Loop ; Clear till BSS end
2 g5 M9 B n; m% e5 ~/ G - 7 e1 l/ a) c4 q7 F
- BL __TI_auto_init ; Call TI auto init
$ l1 x5 S8 q9 |7 K: B - ! M. P8 u/ C8 H7 }
- ;
9 g6 B: D6 a$ t - ; Enter the start_boot function. The execution still happens in system mode6 @* t) k" d4 g: M
- ;) Z9 d, T/ T) t; C4 r
- LDR r10, _start_boot ; Get the address of start_boot0 y F7 _5 y! y" P; D
- MOV lr,pc ; Dummy return
) G3 H$ I# m; r - BX r10 ; Branch to start_boot
+ t: T/ M9 ~/ i' a - SUB pc, pc, #0x08 ; looping4 |" R m( G" S* i
- : {' J- G* U% P2 S0 ^" s
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
4 b2 }0 [0 a3 f: N - ; BX lr
( W9 F4 R# V4 |4 I9 Z - ;
- ]* \2 @7 |! F& l! x+ {( U) C, U" S. I - ; End of the file
6 o% j. s8 d/ T9 ]& j. s! d - ;1 q6 X l9 u% f3 Z) a, b9 b- \7 L
- 8 X1 Z$ {8 Z9 U
- _stackptr:
' m% Q& w" E( p. f% J - .word __STACK_END
6 W _9 s% l( o/ V/ e; @ - _bss_start:* l! k- a. t1 C+ X) E: G
- .word bss_start
8 {. a. n+ b$ f" ^# h- M5 H8 r - _bss_end:
5 ^+ [3 s+ L7 ]. r* G6 J - .word bss_end4 L! ?/ P0 I4 L9 r' s1 z m
- _start_boot:
# G- y3 i+ E* H5 |' Z - .word start_boot
9 y3 e: Y; h- A j6 {, Y7 u - _data_auto_init:" w# u1 C* o7 Y' F) F
- .word __TI_auto_init
; Q2 Y K# p$ j# H. Y( f - .end* j# x9 Z9 V7 [9 W1 [9 _- k. S b4 Y
-
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复制代码
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