| Line 1... |
Line 1... |
////////////////////////////////////////////////////////////////////////////////
|
;///////////////////////////////////////////////////////////////////////////////
|
//
|
;/
|
// Filename: memtest.S
|
;/ Filename: memtest.S
|
//
|
;/
|
// Project: XuLA2 board
|
;/ Project: XuLA2 board
|
//
|
;/
|
// Purpose: To test whether or not we can interface with the SDRAM on the
|
;/ Purpose: To test whether or not we can interface with the SDRAM on the
|
// XuLA2 board.
|
;/ XuLA2 board.
|
//
|
;/
|
//
|
;/
|
// Creator: Dan Gisselquist, Ph.D.
|
;/ Creator: Dan Gisselquist, Ph.D.
|
// Gisselquist Technology, LLC
|
;/ Gisselquist Technology, LLC
|
//
|
;/
|
////////////////////////////////////////////////////////////////////////////////
|
;///////////////////////////////////////////////////////////////////////////////
|
//
|
;/
|
// Copyright (C) 2015, Gisselquist Technology, LLC
|
;/ Copyright (C) 2015, Gisselquist Technology, LLC
|
//
|
;/
|
// This program is free software (firmware): you can redistribute it and/or
|
;/ This program is free software (firmware): you can redistribute it and/or
|
// modify it under the terms of the GNU General Public License as published
|
;/ modify it under the terms of the GNU General Public License as published
|
// by the Free Software Foundation, either version 3 of the License, or (at
|
;/ by the Free Software Foundation, either version 3 of the License, or (at
|
// your option) any later version.
|
;/ your option) any later version.
|
//
|
;/
|
// This program is distributed in the hope that it will be useful, but WITHOUT
|
;/ This program is distributed in the hope that it will be useful, but WITHOUT
|
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
|
;/ ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
;/ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
// for more details.
|
;/ for more details.
|
//
|
;/
|
// License: GPL, v3, as defined and found on www.gnu.org,
|
;/ License: GPL, v3, as defined and found on www.gnu.org,
|
// http://www.gnu.org/licenses/gpl.html
|
;/ http://www.gnu.org/licenses/gpl.html
|
//
|
;/
|
//
|
;/
|
////////////////////////////////////////////////////////////////////////////////
|
;///////////////////////////////////////////////////////////////////////////////
|
//
|
;/
|
//
|
;/
|
#define LFSRFILL 0x000001
|
#define LFSRFILL 0x000001
|
// #define LFSRTAPS 0x004597f
|
;/ #define LFSRTAPS 0x004597f
|
#define LFSRTAPS 0x0408b85
|
#define LFSRTAPS 0x0408b85
|
#define SDRAMBASE 0x0800000
|
#define SDRAMBASE 0x0800000
|
// #define SDRAMLEN 0x0800000
|
;/ #define SDRAMLEN 0x0800000
|
#define SDRAMLEN 0x0800000
|
#define SDRAMLEN 0x0800000
|
#define RAMSCOPE 0x011c
|
#define RAMSCOPE 0x011c
|
#define ZIPSCOPE 0x011e
|
#define ZIPSCOPE 0x011e
|
master_entry:
|
.section .start
|
MOV user_entry(PC),uPC
|
.global _start
|
|
.type _start,@function
|
|
_start:
|
|
LDI user_entry,R0
|
|
MOV R0,uPC
|
; LDI RAMSCOPE,R8
|
; LDI RAMSCOPE,R8
|
; LDI 0x04000000,R9
|
; LDI 0x04000000,R9
|
; STO R9,(R8)
|
; STO R9,(R8)
|
RTU
|
RTU
|
; // Capture what just happened
|
; // Capture what just happened
|
; LDI 0x8c000000,R9
|
; LDI 0x8c000000,R9
|
; STO R9,(R8)
|
; STO R9,(R8)
|
; NOP
|
; NOP
|
;
|
;
|
HALT
|
HALT
|
|
.section .text
|
user_entry:
|
user_entry:
|
// #define CLEAR_MEMORY
|
;/ #define CLEAR_MEMORY
|
#ifdef CLEAR_MEMORY
|
#ifdef CLEAR_MEMORY
|
clear_memory:
|
clear_memory:
|
LDI SDRAMBASE,R0
|
LDI SDRAMBASE,R0
|
LDI SDRAMLEN,R1
|
LDI SDRAMLEN,R1
|
ADD R0,R1
|
ADD R0,R1
|
| Line 77... |
Line 81... |
LDI SDRAMBASE,R0
|
LDI SDRAMBASE,R0
|
LDI SDRAMLEN,R1
|
LDI SDRAMLEN,R1
|
MOV R2,R7 ; Copy our initial fill
|
MOV R2,R7 ; Copy our initial fill
|
CMP 0,R2
|
CMP 0,R2
|
HALT.Z
|
HALT.Z
|
// #define WAIT_FOR_WRITE_SCOPE
|
;/ #define WAIT_FOR_WRITE_SCOPE
|
#ifdef WAIT_FOR_WRITE_SCOPE
|
#ifdef WAIT_FOR_WRITE_SCOPE
|
LDI RAMSCOPE,R8
|
LDI RAMSCOPE,R8
|
LDI 0x01ffc,R9
|
LDI 0x01ffc,R9
|
STO R9,(R8) ; Reset the SDRAM scope
|
STO R9,(R8) ; Reset the SDRAM scope
|
NOP ; Give it a chance to reset
|
NOP ; Give it a chance to reset
|
| Line 114... |
Line 118... |
BGE write_test_loop
|
BGE write_test_loop
|
|
|
read_test:
|
read_test:
|
LDI SDRAMBASE,R0
|
LDI SDRAMBASE,R0
|
LDI SDRAMLEN,R1
|
LDI SDRAMLEN,R1
|
// #define WAIT_FOR_READ_SCOPE
|
;/ #define WAIT_FOR_READ_SCOPE
|
#ifdef WAIT_FOR_READ_SCOPE
|
#ifdef WAIT_FOR_READ_SCOPE
|
LDI RAMSCOPE,R8
|
LDI RAMSCOPE,R8
|
LDI 0x01ffc,R9
|
LDI 0x01ffc,R9
|
STO R9,(R8) ; Reset the SDRAM scope
|
STO R9,(R8) ; Reset the SDRAM scope
|
NOP ; Give it a chance to reset
|
NOP ; Give it a chance to reset
|
| Line 127... |
Line 131... |
NOP
|
NOP
|
LOD (R8),R9
|
LOD (R8),R9
|
TST R10,R9
|
TST R10,R9
|
BZ not_ready
|
BZ not_ready
|
#endif
|
#endif
|
//
|
;/
|
// RAM[49072] = 0x02b39ba ... not RAM[0]. What's going on here?
|
;/ RAM[49072] = 0x02b39ba ... not RAM[0]. What's going on here?
|
//
|
;/
|
read_test_loop:
|
read_test_loop:
|
LOD (R0),R4
|
LOD (R0),R4
|
LOD 1(R0),R5
|
LOD 1(R0),R5
|
LOD 2(R0),R6
|
LOD 2(R0),R6
|
|
|
LSR 1,R7
|
LSR 1,R7
|
XOR.C R3,R7
|
XOR.C R3,R7
|
CMP R7,R4
|
CMP R7,R4
|
TRAP.NZ 0
|
TRAP.NZ 0
|
|
|
LSR 1,R7
|
LSR 1,R7
|
XOR.C R3,R7
|
XOR.C R3,R7
|
CMP R7,R5
|
CMP R7,R5
|
TRAP.NZ 0
|
TRAP.NZ 0
|
|
|
LSR 1,R7
|
LSR 1,R7
|
XOR.C R3,R7
|
XOR.C R3,R7
|
CMP R7,R6
|
CMP R7,R6
|
TRAP.NZ 0
|
TRAP.NZ 0
|
|
|
ADD 3,R0
|
ADD 3,R0
|
SUB 3,R1
|
SUB 3,R1
|
CMP 3,R1
|
CMP 3,R1
|
|
|
BGE read_test_loop
|
BGE read_test_loop
|
|
|
ADD 1,R12
|
ADD 1,R12
|
BRA write_test
|
BRA write_test
|
;
|
|
;
|
|
;
|
|
; 0x0408b85
|
|
; 0x060ce47
|
|
; 0x070eca6
|
|
; 0x0387653
|
|
; 0x05cb0ac
|
|
; 0x02e5856
|
|
; 0x0172c2b
|
|
; 0x04b1d90
|
|
; 0x0258ec8
|
|
; 0x012c764
|
|
; 0x00963b2
|
|
; 0x004b1d9
|
|
; 0x042d369
|
|
; 0x061e231
|
|
; 0x0707a9d
|
|
; ...
|
|
;
|
|
;
|
|
|
|
No newline at end of file
|
No newline at end of file
|
|
;
|
|
;
|
|
;
|
|
; 0x0408b85
|
|
; 0x060ce47
|
|
; 0x070eca6
|
|
; 0x0387653
|
|
; 0x05cb0ac
|
|
; 0x02e5856
|
|
; 0x0172c2b
|
|
; 0x04b1d90
|
|
; 0x0258ec8
|
|
; 0x012c764
|
|
; 0x00963b2
|
|
; 0x004b1d9
|
|
; 0x042d369
|
|
; 0x061e231
|
|
; 0x0707a9d
|
|
; ...
|
|
;
|
|
;
|
|
|
No newline at end of file
|
No newline at end of file
|
