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/*
* (C) Copyright 2015 Leo C. <erbl259-lmu@yahoo.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include "common.h"
#include <stdlib.h>
#include <ctype.h>
#include <stdbool.h>
#include "command.h"
#include "con-utils.h"
#include "z80-if.h"
#include "debug.h"
uint32_t detect_ramsize(void)
{
uint32_t addr;
uint8_t save_addr, save_0;
const uint8_t PATTERN_1 = 0x55;
const uint8_t PATTERN_2 = ~PATTERN_1;
if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
my_puts_P(PSTR("Bus timeout\n"));
return 0;
}
save_0 = z80_read(0);
z80_write(0, PATTERN_1);
for (addr=1; addr < CONFIG_SYS_RAMSIZE_MAX; addr <<= 1) {
save_addr = z80_read(addr);
z80_write(addr, PATTERN_2);
if (z80_read(0) != PATTERN_1 || z80_read(addr) != PATTERN_2)
break;
z80_write(addr, save_addr);
}
z80_write(0, save_0);
z80_bus_cmd(Release);
return addr;
}
typedef enum {
IHX_OK,
IHX_BROKEN,
IHX_CHKSUMERR
} ihx_rstat_t;
typedef struct {
ihx_rstat_t status;
int8_t type;
uint8_t len;
uint16_t address;
uint8_t data[256];
} ihex_t;
static
int get_hexdigit(void) {
int c;
c = toupper(my_getchar(1));
if (isxdigit(c)) {
c -= '0';
if (c > 9)
c -= ('A' - '0' - 10);
return c;
} else
return -1;
}
static
int get_hexbyte(void) {
uint8_t i,j;
if ((i = (uint8_t) get_hexdigit()) < 0x10)
if ((j = (uint8_t) get_hexdigit()) < 0x10) {
return (i<<4) + j;
}
return -1;
}
static
int ihex_get_record(ihex_t *rec) {
int c;
uint8_t sum;
rec->status = IHX_BROKEN;
rec->len = 0;
rec->type = 0xff;
while ((c = my_getchar(0)) != ':') {
if (c == 0x03)
return -1; /* Control-C */
if (c == 0x04) {
rec->status = IHX_OK;
return 0; /*Control-D, EOF */
}
}
if ((c = get_hexbyte()) < 0) /* Start code */
return -1;
sum = c;
rec->len = c;
if ((c = get_hexbyte()) < 0) /* Byte Count */
return -1;
sum += c;
rec->address = c * 256;
if ((c = get_hexbyte()) < 0) /* Address */
return -1;
sum += c;
rec->address += c;
if ((c = get_hexbyte()) < 0) /* Record type */
return -1;
sum += c;
rec->type = c;
if (rec->len) { /* Record Data */
uint8_t n;
for (n = 0; n < rec->len; n++) {
if ((c = get_hexbyte()) < 0)
break;
sum += c;
rec->data[n] = c;
}
if (n < rec->len) {
return -1;
}
}
c = get_hexbyte(); /* Check sum */
if (c >= 0) {
sum += c;
if (sum == 0)
rec->status = IHX_OK;
else
rec->status = IHX_CHKSUMERR;
}
return rec->len;
}
command_ret_t do_loadihex(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
long offset = 0;
uint32_t base_address = 0;
uint32_t address_max = detect_ramsize();
uint32_t address_high = 0;
uint32_t address_low = address_max;
command_ret_t rcode = CMD_RET_FAILURE;
ihex_t rec;
bool firstrec = true;
(void) cmdtp; (void) flag;
if (argc > 1)
offset = strtol(argv[1], NULL, 16);
printf_P(PSTR("Waiting for Intel Hex Records...\n"));
while (ihex_get_record(&rec) > 0 &&
rec.status == IHX_OK &&
rec.type != 1 ) {
switch (rec.type) {
case 0: /* Data record */
if (firstrec) {
printf_P(PSTR("Loading: 0x....."));
firstrec = false;
}
if (rec.len) {
uint32_t addr = base_address + rec.address + offset;
if (addr < address_low)
address_low = addr;
if (addr+rec.len > address_high)
address_high = addr + rec.len;
// debug("low: 0x%.5lX, high: 0x%.5lX, max: 0x%.5lX, addr: 0x%.5lX, len: %d\n",
// address_low, address_high, address_max, addr, rec.len);
printf_P(PSTR("\b\b\b\b\b%.5lX"), addr);
if (addr < address_max) {
uint32_t tmplen = address_max - addr;
if (rec.len > tmplen)
rec.len = tmplen;
if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
my_puts_P(PSTR("Bus timeout\n"));
return CMD_RET_FAILURE;
}
z80_write_block(rec.data, /* src */
addr, /* dest */
rec.len); /* len */
z80_bus_cmd(Release);
}
}
break;
#if 0
case 1: /* EOF record */
break;
#endif
case 2: /* Extended Segment Address Record */
base_address = (uint32_t)((rec.data[0] << 8) + rec.data[1]) << 4;
break;
case 4: /* Extended Linear Address Record */
base_address = (uint32_t)((rec.data[0] << 8) + rec.data[1]) << 16;
break;
case 3: /* Start Segment Address Record (ignored)*/
case 5: /* Start Linear Address Record (ignored)*/
break;
}
}
switch (rec.status) {
case IHX_OK:
rcode = CMD_RET_SUCCESS;
break;
case IHX_BROKEN:
case IHX_CHKSUMERR:
printf_P(PSTR("Broken Hex Record or loading interrupted!\n"));
break;
}
for (uint_fast8_t i=0; i<100; ++i) {
/* flush input buffer */
while (my_getchar(0) > 0)
;
udelay(1000);
}
printf_P(PSTR("\nData loaded: "));
if (address_low >= MIN(address_high, address_max))
printf_P(PSTR("None.\n"));
else
printf_P(PSTR("low: 0x%.5lX high: 0x%.5lX\n"), address_low,
MIN(address_high, address_max) - 1);
if (address_high > address_max)
printf_P(PSTR("Data above highest RAM address "
"(in range 0x%.5lX - 0x%.5lX) ignored!\n"), address_max, address_high - 1);
return rcode;
}
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