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unicorn06 发表于 2017-4-21 14:34
( T" N3 E) a+ m& M& N* I1 c! b,高手~~~
9 W1 @; N6 R& `7 Y% p, _- r" ~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 ... 2 C5 H X4 ~' t8 {
在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
# L& W2 o' d: z, d/* 重新配置程序入口点 */
" z R' i( R2 [# u& j" D8 r7 ^-e Entry- /****************************************************************************/0 L" x3 o2 p9 X$ p8 X6 Z
- /* */" _* e1 a' V9 c8 _4 U6 c5 b2 s
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */
+ t5 C( v9 a) i: F1 ~; W8 S t - /* */
7 ~* V1 o+ B# f( f - /* 2015年04月20日 */
. w' U7 [9 w+ C3 E5 I0 G& F' ~ - /* */6 X1 \( w- }, c4 x( ^! U
- /****************************************************************************/
( {: z$ c& ], I - /* 堆栈 */# l5 f+ ~9 S9 Q) a$ A
- -stack 0x8000
9 q3 h/ _% Q& V. k& Q - -heap 0x2000
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- /* 重新配置程序入口点 */; K" }! U+ _* I3 ?
- -e Entry8 Y- _5 m) o) W) O6 W! [
- " m% o+ G& [5 L$ f) o
- MEMORY. K# y) ]* F, F5 U H% F
- {" @1 w; V4 P3 `' u! I# y$ d
- #ifdef DSP_CORE
% N7 t# U- @& K7 f - /****************************************************************************/' C S, M) B# B K' ]
- /* */. y' M4 d }. A3 `, U& [+ }" P: h8 F
- /* DSP 专有内存区域 */
" S; ^" s: i7 ~' B% A% w - /* */
0 }) L& E! P; H$ H' J$ a: ?3 N - /****************************************************************************/
8 y+ F( L$ S& d% x/ n9 u - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */4 C" U3 o9 l8 s: p! q
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
1 x6 C6 i, j# E1 C5 p( \5 N) @ - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */
2 r: e2 \: F% c' m/ |1 ` - DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */8 G1 ^7 V4 K7 ]# `
- #endif
复制代码 这是一段汇编代码用于切换到特权模式
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: q G4 \/ f. QOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm3 \. S/ U0 E4 u2 q& \
- ;******************************************************************************$ T K5 }# f, z: j& e
- ;
" K/ R; }- I4 x - ; init.asm - Init code routines
7 m$ a7 r( v' R% K - ;8 E) I) v- ^* e6 E
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/* }2 ]5 |3 I) ~( r3 L' S/ `" j% B, q
- ; All rights reserved.# }. |! |: ^7 Y2 B5 R& s
- ;
- n) n! \& H2 T5 S, S' Y/ X/ f) k - ;******************************************************************************
) o. l- l: X: e* u6 I; m1 X - ;****************************** Global Symbols*******************************
- d- X4 k+ l6 q1 N& Q - .global Entry
( l+ K j2 P; I5 n+ p" l H - .global start_boot* E0 v% v V5 Y. j+ a
- .global __TI_auto_init1 X& n7 ~7 A5 \* V% I: v+ F
- ! M0 ^$ ]1 C. N* }
- .ref __stack
9 N5 e$ n! ~9 |' F! O# p4 E - .ref __STACK_END# i9 N# d# u6 h' ]( W' h% I
- .ref bss_start1 j$ e3 r7 A4 ~3 i( g
- .ref bss_end
7 m ?( V% k6 @9 |7 X) n* T! o - .ref start_boot( f8 w+ ~- s7 l9 t ^
- 6 q% e- D: }8 A8 }' ?
- ;************************ Internal Definitions ******************************, g7 J+ h r4 L6 l% W
- ; n, z8 W1 w5 r& M. U0 M' K
- ; Define the stack sizes for different modes. The user/system mode will use
0 |) A) b) F$ e3 M- G, a: i* _ - ; the rest of the total stack size
) }* ~4 e5 z* p9 F! B - ;
! Y+ p4 _: {$ b& D
+ {! l- k/ @! M9 J: A- UND_STACK_SIZE .set 0x8
: o3 K7 j9 A- i% D; k7 ? - ABT_STACK_SIZE .set 0x8
' q7 c- D+ S; f: I( c - FIQ_STACK_SIZE .set 0x8: c% X9 m+ ]) [$ H. j% f
- IRQ_STACK_SIZE .set 0x500; n% O" u w v. ~1 N
- SVC_STACK_SIZE .set 0x8
" c( V2 S/ Y% F: b8 |0 F0 ] - ; R- D( A2 b' Q1 c8 G% h* Y% p5 O
- ; d* O' F7 ^; [* v2 e
- ; to set the mode bits in CPSR for different modes! L# `- Y4 `$ f+ D
- ;
; F4 I+ P! @1 J5 S+ _1 w - . M/ X0 {( E! s! a
- MODE_USR .set 0x10- E' h/ z" e, t
- MODE_FIQ .set 0x11* E4 }4 |' g* m0 X
- MODE_IRQ .set 0x12
* _& r" \5 L9 Y$ q- q; @ - MODE_SVC .set 0x13+ V" Y/ d' q8 B8 ]. Y9 R' L! Q
- MODE_ABT .set 0x17: W+ T3 y* P" \- b
- MODE_UND .set 0x1B, M4 v+ |; |4 d S8 N
- MODE_SYS .set 0x1F
g& o v& u0 {3 j! e. N - " X$ k0 d. Z4 p S* W% {
- I_F_BIT .set 0xC0
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0 R, \- U" ?0 O0 z2 P( C9 l ]- ;**************************** Code Seection ***********************************$ Z( I* u( B, O/ x+ @; O8 i6 B6 x
- .text" p+ k2 H' r8 L* H; Z! \" s+ ~
5 E! k9 D; }" u' P, K- ;7 I* t% \" r. Z5 P7 J7 ?
- ; This code is assembled for ARM instructions
2 g- \2 k* u& n1 J6 ~1 R - ;
+ O; t' H5 K ~! v - .state32
! n- q; _" j% U- y. Q6 F - 8 ?/ A8 L& w; f7 G/ p
- ;******************************************************************************' ~! Z6 S% e8 @8 \& n
- ;& v7 q S! B7 T& \+ y x
- ;******************************************************************************
! L; D! G+ G0 v. ?; R# B* Q& x - ;
\) C. l/ _ }3 r7 ] - ; The reset handler sets up the stack pointers for all the modes. The FIQ and* g/ K. W) D ^ s- y
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
0 _) _! {# M& Y5 [ - ; main() function.
' S) B7 ]3 ?4 Z3 M& x7 i; t - ;( ]; K6 N' Z+ }% `3 m
- Entry:
# _7 ~& e9 T' D1 `, k - ;
5 G! y2 [6 v' K7 a2 ?" ~5 P' s - ; Set up the Stack for Undefined mode
; V4 A8 b, L+ k: w$ Z1 t6 a9 b - ;7 B' F% B( Z+ @2 F E; f
- LDR r0, _stackptr ; Read and align the stack pointer9 O1 d/ D- O) L. J7 o. t1 k' T0 z
- SUB r0, r0, #8, P& ]$ r: ? E% `
- BIC r0, r0, #7+ H! k/ u: L) S# w8 e7 s
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode S2 a7 k7 Z7 s* W
- MOV sp,r0 ; write the stack pointer
2 Q; [3 n0 }9 j - SUB r0, r0, #UND_STACK_SIZE ; give stack space
( L% F _! w$ B- C% W - ;- K# L' `( L% [7 d
- ; Set up the Stack for abort mode5 f" [4 a# ~- r- _
- ;0 J% q- ]6 p# R" z0 Z( \
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
8 i% B; ]( y3 R& ]! t, R - MOV sp, r0 ; write the stack pointer
7 u* O: g" x. Q - SUB r0,r0, #ABT_STACK_SIZE ; give stack space+ N+ R6 X: R+ X- n. X3 e
- ;' \& a7 I: ]* P3 i. v" g$ p, g
- ; Set up the Stack for FIQ mode
& V7 l! b: l4 @ @, _ - ;5 S1 `; S% V! x8 M/ |# B: ~
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode
7 ^" T! g) f# s" P: F - MOV sp,r0 ; write the stack pointer
# |) p3 \! w3 H% i7 B& B - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space
' w- E: }$ D" s# w - ;
; D- L" Z y+ t7 H - ; Set up the Stack for IRQ mode
) [( g* Y# m0 c7 V - ;* R! [* R% f& P8 T
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode: X8 n) ~9 |& K
- MOV sp,r0 ; write the stack pointer
. @8 {) c3 D) m Q) t6 O - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space5 t" _/ Y+ z4 ]
- ;" x% N1 _( t# {5 q5 Q# b
- ; Set up the Stack for SVC mode' _0 G1 J; x/ f( Q* g: A
- ;
* H4 B+ r6 _& S - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
# B- h/ x: ?9 h: i - MOV sp,r0 ; write the stack pointer3 N5 s. L- w; m5 D
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space
( [# b% m; J8 e$ r2 z) |1 f2 ^ - ;
, z! m. i% D3 h# W \0 { - ; Set up the Stack for USer/System mode2 b: h% y5 e, B$ m x @
- ;% C' m r, l# y2 |; z
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode& V5 {: S, h, }3 n1 [( S- Q# ~
- MOV sp,r0 ; write the stack pointer. x) ]5 G: G( `! }
, I6 {0 I2 R% E$ n: E' g& M- ;9 N6 h8 `$ Z0 t- Z8 L, N
- ; Clear the BSS section here
% L: X8 E* c E, S4 b5 u7 U0 z; f - ;1 w1 \: {2 d& v7 t6 M6 r
- Clear_Bss_Section:* n8 O) V7 i* x, d' \
- 7 r) x, D3 z0 [9 m' @5 X, k
- LDR r0, _bss_start ; Start address of BSS7 t+ O' `3 [" \7 M& f. V3 j
- LDR r1, _bss_end ; End address of BSS
$ _9 A9 a1 n0 {/ Y - SUB r1,r1,#49 G9 J( B( l, D/ w
- MOV r2, #0
9 ?- S/ h9 b0 B& t E* C9 G( B, w$ ]2 @ - Loop:
7 Q: W3 { m2 ^* Y4 t7 C - STR r2, [r0], #4 ; Clear one word in BSS4 n# D- t9 K! P0 i0 h: M6 l
- CMP r0, r1
8 h* t+ ~; n5 ^9 T8 }" v - BLE Loop ; Clear till BSS end. [$ v) W; Z- D9 P9 R4 _. M
- 8 p; E: G% ~0 J3 r* A2 R0 k/ W/ o
- BL __TI_auto_init ; Call TI auto init+ F, s, N1 W( S! B8 ?3 H
- / _, L1 o& r2 t. a6 F) U( K1 g
- ;
5 A2 C9 o# L& ^! Q3 p" s) S; r( Q - ; Enter the start_boot function. The execution still happens in system mode
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- LDR r10, _start_boot ; Get the address of start_boot
/ x" A! S( d" A. c* t - MOV lr,pc ; Dummy return
; W4 F, m K; ^9 \9 d- K - BX r10 ; Branch to start_boot9 @/ J7 A S0 Y6 b8 b. x
- SUB pc, pc, #0x08 ; looping/ O/ U! y; _' c9 [, d8 W
- 3 Y$ q& i _3 P! G) f3 h$ M* V
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode O2 _& X: s# [ J4 Q+ y5 ~
- ; BX lr6 D2 X9 e( C0 D6 Z8 g5 ?' ]/ {
- ;
1 p S9 n2 d9 g+ ]+ e' M - ; End of the file
4 N t. U9 Q+ L/ d - ;" Y4 m0 w' v" V5 ?
/ s0 g: p: \) U- _stackptr:
( }2 p( s4 I6 m, P( W - .word __STACK_END9 U7 Q! r0 ?3 A% _. c
- _bss_start:
+ a5 t) i2 P$ q& z. | - .word bss_start
" X9 b' T9 X9 a0 U- V( M n - _bss_end:
/ I! p% q/ N" u/ @4 H( I" | - .word bss_end/ E1 \& G4 K' w) M- l8 ~2 j
- _start_boot:
; t0 I; \' H5 i: J1 l$ o3 t. | - .word start_boot& W! M a- L/ M# O
- _data_auto_init:
7 F' `5 M, w2 [+ x5 v: J# ~0 M - .word __TI_auto_init
* m9 r' y: \1 a+ D- @; O! T% E - .end
# |6 x7 Q/ W; X -
# g) h: o8 m4 W$ B2 ]5 h M1 j
5 B9 |; f. c. Q& O: o! m4 t+ j) Y' T- ]- F* |; G4 j. Y1 |
复制代码
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