| /* |
| * (C) Copyright Mindspeed Technologies Inc. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| /* This code is used to setup the boot CS to 16bit so that |
| the U-boot image can be read from NOR flash. It is compiled into |
| a special section (and format) using the u-boot.lds linker script and |
| u16_to_u8.c application */ |
| |
| #include <config.h> |
| #include <asm/arch/hardware.h> |
| |
| .globl _start |
| _start: |
| adr r0, iram_code_start |
| ldr r1, iram_addr |
| adr r2, iram_code_end |
| |
| copy: |
| ldmia r0!, {r3-r6} /* copy from source address [r0] */ |
| stmia r1!, {r3-r6} /* copy to target address [r1] */ |
| cmp r0, r2 /* until source end address [r2] */ |
| ble copy |
| |
| /* Calculate return address, offset is multiplied by 2 */ |
| adr r0, _start |
| add r1, r2, r2 |
| sub lr, r1, r0 |
| |
| /* Jump to internal RAM */ |
| ldr pc, iram_addr |
| |
| iram_addr: |
| .word IRAM_BASEADDR |
| |
| |
| /* This codes runs from internal RAM and |
| sets the boot chip select */ |
| iram_code_start: |
| ldr r0, cs_reg |
| ldr r1, cs_val |
| strh r1, [r0] |
| |
| /* Jump back to flash, now running in 16 bit */ |
| mov pc, lr |
| |
| cs_reg: |
| .word SDC0_CSBOOT_CFG |
| |
| cs_val: |
| .word 0x081E |
| |
| iram_code_end: |
