144 lines
3.5 KiB
ArmAsm
144 lines
3.5 KiB
ArmAsm
|
/*
|
||
|
|
* Rescue code to be prepended on a kimage and copied to the
|
||
|
|
* rescue serial port.
|
||
|
|
* This is called from the rescue code, it will copy received data to
|
||
|
|
* 4004000 and after a timeout jump to it.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define ASSEMBLER_MACROS_ONLY
|
||
|
|
#include <arch/sv_addr_ag.h>
|
||
|
|
|
||
|
|
#define CODE_START 0x40004000
|
||
|
|
#define CODE_LENGTH 784
|
||
|
|
#define TIMEOUT_VALUE 1000
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef CONFIG_ETRAX_RESCUE_SER0
|
||
|
|
#define SERXOFF R_SERIAL0_XOFF
|
||
|
|
#define SERBAUD R_SERIAL0_BAUD
|
||
|
|
#define SERRECC R_SERIAL0_REC_CTRL
|
||
|
|
#define SERRDAT R_SERIAL0_REC_DATA
|
||
|
|
#define SERSTAT R_SERIAL0_STATUS
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_ETRAX_RESCUE_SER1
|
||
|
|
#define SERXOFF R_SERIAL1_XOFF
|
||
|
|
#define SERBAUD R_SERIAL1_BAUD
|
||
|
|
#define SERRECC R_SERIAL1_REC_CTRL
|
||
|
|
#define SERRDAT R_SERIAL1_REC_DATA
|
||
|
|
#define SERSTAT R_SERIAL1_STATUS
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_ETRAX_RESCUE_SER2
|
||
|
|
#define SERXOFF R_SERIAL2_XOFF
|
||
|
|
#define SERBAUD R_SERIAL2_BAUD
|
||
|
|
#define SERRECC R_SERIAL2_REC_CTRL
|
||
|
|
#define SERRDAT R_SERIAL2_REC_DATA
|
||
|
|
#define SERSTAT R_SERIAL2_STATUS
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_ETRAX_RESCUE_SER3
|
||
|
|
#define SERXOFF R_SERIAL3_XOFF
|
||
|
|
#define SERBAUD R_SERIAL3_BAUD
|
||
|
|
#define SERRECC R_SERIAL3_REC_CTRL
|
||
|
|
#define SERRDAT R_SERIAL3_REC_DATA
|
||
|
|
#define SERSTAT R_SERIAL3_STATUS
|
||
|
|
#endif
|
||
|
|
|
||
|
|
.text
|
||
|
|
;; This is the entry point of the rescue code
|
||
|
|
;; 0x80000000 if loaded in flash (as it should be)
|
||
|
|
;; since etrax actually starts at address 2 when booting from flash, we
|
||
|
|
;; put a nop (2 bytes) here first so we dont accidentally skip the di
|
||
|
|
|
||
|
|
nop
|
||
|
|
di
|
||
|
|
#ifndef CONFIG_SVINTO_SIM
|
||
|
|
;; setup port PA and PB default initial directions and data
|
||
|
|
;; (so we can flash LEDs, and so that DTR and others are set)
|
||
|
|
|
||
|
|
move.b CONFIG_ETRAX_DEF_R_PORT_PA_DIR, $r0
|
||
|
|
move.b $r0, [R_PORT_PA_DIR]
|
||
|
|
move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA, $r0
|
||
|
|
move.b $r0, [R_PORT_PA_DATA]
|
||
|
|
|
||
|
|
move.b CONFIG_ETRAX_DEF_R_PORT_PB_DIR, $r0
|
||
|
|
move.b $r0, [R_PORT_PB_DIR]
|
||
|
|
move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA, $r0
|
||
|
|
move.b $r0, [R_PORT_PB_DATA]
|
||
|
|
|
||
|
|
;; We need to setup the bus registers before we start using the DRAM
|
||
|
|
#include "../../lib/dram_init.S"
|
||
|
|
|
||
|
|
#endif
|
||
|
|
;; Setup the stack to a suitably high address.
|
||
|
|
;; We assume 8 MB is the minimum DRAM in an eLinux
|
||
|
|
;; product and put the sp at the top for now.
|
||
|
|
|
||
|
|
move.d 0x40800000, $sp
|
||
|
|
|
||
|
|
;; setup the serial port at 115200 baud
|
||
|
|
|
||
|
|
moveq 0, $r0
|
||
|
|
move.d $r0, [SERXOFF]
|
||
|
|
|
||
|
|
move.b 0x99, $r0
|
||
|
|
move.b $r0, [SERBAUD] ; 115.2kbaud for both transmit
|
||
|
|
; and receive
|
||
|
|
|
||
|
|
move.b 0x40, $r0 ; rec enable
|
||
|
|
move.b $r0, [SERRECC]
|
||
|
|
|
||
|
|
|
||
|
|
moveq 0, $r1 ; "timer" to clock out a LED red flash
|
||
|
|
move.d CODE_START, $r3 ; destination counter
|
||
|
|
move.d CODE_LENGTH, $r4 ; length
|
||
|
|
move.d TIMEOUT_VALUE, $r5 ; "timeout" until jump
|
||
|
|
|
||
|
|
wait_ser:
|
||
|
|
addq 1, $r1
|
||
|
|
subq 1, $r5 ; decrease timeout
|
||
|
|
beq jump_start ; timed out
|
||
|
|
nop
|
||
|
|
#ifndef CONFIG_ETRAX_NO_LEDS
|
||
|
|
#ifdef CONFIG_ETRAX_PA_LEDS
|
||
|
|
move.b CONFIG_ETRAX_DEF_R_PORT_PA_DATA, $r2
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_ETRAX_PB_LEDS
|
||
|
|
move.b CONFIG_ETRAX_DEF_R_PORT_PB_DATA, $r2
|
||
|
|
#endif
|
||
|
|
move.d (1 << CONFIG_ETRAX_LED1R) | (1 << CONFIG_ETRAX_LED2R), $r0
|
||
|
|
btstq 16, $r1
|
||
|
|
bpl 1f
|
||
|
|
nop
|
||
|
|
or.d $r0, $r2 ; set bit
|
||
|
|
ba 2f
|
||
|
|
nop
|
||
|
|
1: not $r0 ; clear bit
|
||
|
|
and.d $r0, $r2
|
||
|
|
2:
|
||
|
|
#ifdef CONFIG_ETRAX_PA_LEDS
|
||
|
|
move.b $r2, [R_PORT_PA_DATA]
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_ETRAX_PB_LEDS
|
||
|
|
move.b $r2, [R_PORT_PB_DATA]
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
;; check if we got something on the serial port
|
||
|
|
|
||
|
|
move.b [SERSTAT], $r0
|
||
|
|
btstq 0, $r0 ; data_avail
|
||
|
|
bpl wait_ser
|
||
|
|
nop
|
||
|
|
|
||
|
|
;; got something - copy the byte and loop
|
||
|
|
|
||
|
|
move.b [SERRDAT], $r0
|
||
|
|
move.b $r0, [$r3+]
|
||
|
|
move.d TIMEOUT_VALUE, $r5 ; reset "timeout"
|
||
|
|
subq 1, $r4 ; decrease length
|
||
|
|
bne wait_ser
|
||
|
|
nop
|
||
|
|
jump_start:
|
||
|
|
;; jump into downloaded code
|
||
|
|
|
||
|
|
jump CODE_START
|