| 1 | /* |
| 2 | * Startup Code for MIPS32 XBURST CPU-core |
| 3 | * |
| 4 | * Copyright (c) 2010 Xiangfu Liu <xiangfu@sharism.cc> |
| 5 | * |
| 6 | * See file CREDITS for list of people who contributed to this |
| 7 | * project. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License as |
| 11 | * published by the Free Software Foundation; either version 3 of |
| 12 | * the License, or (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 22 | * MA 02111-1307 USA |
| 23 | */ |
| 24 | |
| 25 | #include <config.h> |
| 26 | #include <version.h> |
| 27 | #include <asm/regdef.h> |
| 28 | #include <asm/mipsregs.h> |
| 29 | #include <asm/addrspace.h> |
| 30 | #include <asm/cacheops.h> |
| 31 | |
| 32 | #include <asm/jz4740.h> |
| 33 | |
| 34 | .set noreorder |
| 35 | |
| 36 | .globl _start |
| 37 | .text |
| 38 | _start: |
| 39 | .word JZ4740_NANDBOOT_CFG /* fetched during NAND Boot */ |
| 40 | reset: |
| 41 | /* |
| 42 | * STATUS register |
| 43 | * CU0=UM=EXL=IE=0, BEV=ERL=1, IP2~7=1 |
| 44 | */ |
| 45 | li t0, 0x0040FC04 |
| 46 | mtc0 t0, CP0_STATUS |
| 47 | /* CAUSE register |
| 48 | * IV=1, use the specical interrupt vector (0x200) */ |
| 49 | li t1, 0x00800000 |
| 50 | mtc0 t1, CP0_CAUSE |
| 51 | |
| 52 | bal 1f |
| 53 | nop |
| 54 | .word _GLOBAL_OFFSET_TABLE_ |
| 55 | 1: |
| 56 | move gp, ra |
| 57 | lw t1, 0(ra) |
| 58 | move gp, t1 |
| 59 | |
| 60 | la sp, 0x80004000 |
| 61 | la t9, nand_boot |
| 62 | j t9 |
| 63 | nop |
| 64 | |
