Add support for ymodem protocol (loady command).
Patch by Stefano Babic, 29 Mar 2006
diff --git a/common/xyzModem.c b/common/xyzModem.c
new file mode 100644
index 0000000..3c86b13
--- /dev/null
+++ b/common/xyzModem.c
@@ -0,0 +1,739 @@
+//==========================================================================
+//
+// xyzModem.c
+//
+// RedBoot stream handler for xyzModem protocol
+//
+//==========================================================================
+//####ECOSGPLCOPYRIGHTBEGIN####
+// -------------------------------------------
+// This file is part of eCos, the Embedded Configurable Operating System.
+// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
+// Copyright (C) 2002 Gary Thomas
+//
+// eCos 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 or (at your option) any later version.
+//
+// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
+// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+//
+// As a special exception, if other files instantiate templates or use macros
+// or inline functions from this file, or you compile this file and link it
+// with other works to produce a work based on this file, this file does not
+// by itself cause the resulting work to be covered by the GNU General Public
+// License. However the source code for this file must still be made available
+// in accordance with section (3) of the GNU General Public License.
+//
+// This exception does not invalidate any other reasons why a work based on
+// this file might be covered by the GNU General Public License.
+//
+// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
+// at http://sources.redhat.com/ecos/ecos-license/
+// -------------------------------------------
+//####ECOSGPLCOPYRIGHTEND####
+//==========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s): gthomas
+// Contributors: gthomas, tsmith, Yoshinori Sato
+// Date: 2000-07-14
+// Purpose:
+// Description:
+//
+// This code is part of RedBoot (tm).
+//
+//####DESCRIPTIONEND####
+//
+//==========================================================================
+#include <common.h>
+#include <xyzModem.h>
+#include <stdarg.h>
+#include <crc.h>
+
+// Assumption - run xyzModem protocol over the console port
+
+// Values magic to the protocol
+#define SOH 0x01
+#define STX 0x02
+#define EOT 0x04
+#define ACK 0x06
+#define BSP 0x08
+#define NAK 0x15
+#define CAN 0x18
+#define EOF 0x1A // ^Z for DOS officionados
+
+#define USE_YMODEM_LENGTH
+
+// Data & state local to the protocol
+static struct {
+#ifdef REDBOOT
+ hal_virtual_comm_table_t* __chan;
+#else
+ int *__chan;
+#endif
+ unsigned char pkt[1024], *bufp;
+ unsigned char blk,cblk,crc1,crc2;
+ unsigned char next_blk; // Expected block
+ int len, mode, total_retries;
+ int total_SOH, total_STX, total_CAN;
+ bool crc_mode, at_eof, tx_ack;
+#ifdef USE_YMODEM_LENGTH
+ unsigned long file_length, read_length;
+#endif
+} xyz;
+
+#define xyzModem_CHAR_TIMEOUT 2000 // 2 seconds
+#define xyzModem_MAX_RETRIES 20
+#define xyzModem_MAX_RETRIES_WITH_CRC 10
+#define xyzModem_CAN_COUNT 3 // Wait for 3 CAN before quitting
+
+
+#ifndef REDBOOT //SB
+typedef int cyg_int32;
+int CYGACC_COMM_IF_GETC_TIMEOUT (char chan,char *c) {
+#define DELAY 20
+ unsigned long counter=0;
+ while (!tstc() && (counter < xyzModem_CHAR_TIMEOUT*1000/DELAY)) {
+ udelay(DELAY);
+ counter++;
+ }
+ if (tstc()) {
+ *c=getc();
+ return 1;
+ }
+ return 0;
+}
+
+void CYGACC_COMM_IF_PUTC(char x,char y) {
+ putc(y);
+}
+
+// Validate a hex character
+__inline__ static bool
+_is_hex(char c)
+{
+ return (((c >= '0') && (c <= '9')) ||
+ ((c >= 'A') && (c <= 'F')) ||
+ ((c >= 'a') && (c <= 'f')));
+}
+
+// Convert a single hex nibble
+__inline__ static int
+_from_hex(char c)
+{
+ int ret = 0;
+
+ if ((c >= '0') && (c <= '9')) {
+ ret = (c - '0');
+ } else if ((c >= 'a') && (c <= 'f')) {
+ ret = (c - 'a' + 0x0a);
+ } else if ((c >= 'A') && (c <= 'F')) {
+ ret = (c - 'A' + 0x0A);
+ }
+ return ret;
+}
+
+// Convert a character to lower case
+__inline__ static char
+_tolower(char c)
+{
+ if ((c >= 'A') && (c <= 'Z')) {
+ c = (c - 'A') + 'a';
+ }
+ return c;
+}
+
+
+
+//
+// Parse (scan) a number
+//
+bool
+parse_num(char *s, unsigned long *val, char **es, char *delim)
+{
+ bool first = true;
+ int radix = 10;
+ char c;
+ unsigned long result = 0;
+ int digit;
+
+ while (*s == ' ') s++;
+ while (*s) {
+ if (first && (s[0] == '0') && (_tolower(s[1]) == 'x')) {
+ radix = 16;
+ s += 2;
+ }
+ first = false;
+ c = *s++;
+ if (_is_hex(c) && ((digit = _from_hex(c)) < radix)) {
+ // Valid digit
+#ifdef CYGPKG_HAL_MIPS
+ // FIXME: tx49 compiler generates 0x2539018 for MUL which
+ // isn't any good.
+ if (16 == radix)
+ result = result << 4;
+ else
+ result = 10 * result;
+ result += digit;
+#else
+ result = (result * radix) + digit;
+#endif
+ } else {
+ if (delim != (char *)0) {
+ // See if this character is one of the delimiters
+ char *dp = delim;
+ while (*dp && (c != *dp)) dp++;
+ if (*dp) break; // Found a good delimiter
+ }
+ return false; // Malformatted number
+ }
+ }
+ *val = result;
+ if (es != (char **)0) {
+ *es = s;
+ }
+ return true;
+}
+
+#endif
+
+#define USE_SPRINTF
+#ifdef DEBUG
+#ifndef USE_SPRINTF
+//
+// Note: this debug setup only works if the target platform has two serial ports
+// available so that the other one (currently only port 1) can be used for debug
+// messages.
+//
+static int
+zm_dprintf(char *fmt, ...)
+{
+ int cur_console;
+ va_list args;
+
+ va_start(args, fmt);
+#ifdef REDBOOT
+ cur_console = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
+ CYGACC_CALL_IF_SET_CONSOLE_COMM(1);
+#endif
+ diag_vprintf(fmt, args);
+#ifdef REDBOOT
+ CYGACC_CALL_IF_SET_CONSOLE_COMM(cur_console);
+#endif
+}
+
+static void
+zm_flush(void)
+{
+}
+
+#else
+//
+// Note: this debug setup works by storing the strings in a fixed buffer
+//
+#define FINAL
+#ifdef FINAL
+static char *zm_out = (char *)0x00380000;
+static char *zm_out_start = (char *)0x00380000;
+#else
+static char zm_buf[8192];
+static char *zm_out=zm_buf;
+static char *zm_out_start = zm_buf;
+
+#endif
+static int
+zm_dprintf(char *fmt, ...)
+{
+ int len;
+ va_list args;
+
+ va_start(args, fmt);
+ len = diag_vsprintf(zm_out, fmt, args);
+ zm_out += len;
+ return len;
+}
+
+static void
+zm_flush(void)
+{
+ char *p = zm_out_start;
+#ifdef REDBOOT
+ while (*p) mon_write_char(*p++);
+#endif
+ zm_out = zm_out_start;
+}
+#endif
+
+static void
+zm_dump_buf(void *buf, int len)
+{
+#ifdef REDBOOT
+ diag_vdump_buf_with_offset(zm_dprintf, buf, len, 0);
+#else
+
+#endif
+}
+
+static unsigned char zm_buf[2048];
+static unsigned char *zm_bp;
+
+static void
+zm_new(void)
+{
+ zm_bp = zm_buf;
+}
+
+static void
+zm_save(unsigned char c)
+{
+ *zm_bp++ = c;
+}
+
+static void
+zm_dump(int line)
+{
+ zm_dprintf("Packet at line: %d\n", line);
+ zm_dump_buf(zm_buf, zm_bp-zm_buf);
+}
+
+#define ZM_DEBUG(x) x
+#else
+#define ZM_DEBUG(x)
+#endif
+
+// Wait for the line to go idle
+static void
+xyzModem_flush(void)
+{
+ int res;
+ char c;
+ while (true) {
+ res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &c);
+ if (!res) return;
+ }
+}
+
+static int
+xyzModem_get_hdr(void)
+{
+ char c;
+ int res;
+ bool hdr_found = false;
+ int i, can_total, hdr_chars;
+ unsigned short cksum;
+
+ ZM_DEBUG(zm_new());
+ // Find the start of a header
+ can_total = 0;
+ hdr_chars = 0;
+
+ if (xyz.tx_ack) {
+ CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
+ xyz.tx_ack = false;
+ }
+ while (!hdr_found) {
+ res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &c);
+ ZM_DEBUG(zm_save(c));
+ if (res) {
+ hdr_chars++;
+ switch (c) {
+ case SOH:
+ xyz.total_SOH++;
+ case STX:
+ if (c == STX) xyz.total_STX++;
+ hdr_found = true;
+ break;
+ case CAN:
+ xyz.total_CAN++;
+ ZM_DEBUG(zm_dump(__LINE__));
+ if (++can_total == xyzModem_CAN_COUNT) {
+ return xyzModem_cancel;
+ } else {
+ // Wait for multiple CAN to avoid early quits
+ break;
+ }
+ case EOT:
+ // EOT only supported if no noise
+ if (hdr_chars == 1) {
+ CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
+ ZM_DEBUG(zm_dprintf("ACK on EOT #%d\n", __LINE__));
+ ZM_DEBUG(zm_dump(__LINE__));
+ return xyzModem_eof;
+ }
+ default:
+ // Ignore, waiting for start of header
+ ;
+ }
+ } else {
+ // Data stream timed out
+ xyzModem_flush(); // Toss any current input
+ ZM_DEBUG(zm_dump(__LINE__));
+ CYGACC_CALL_IF_DELAY_US((cyg_int32)250000);
+ return xyzModem_timeout;
+ }
+ }
+
+ // Header found, now read the data
+ res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.blk);
+ ZM_DEBUG(zm_save(xyz.blk));
+ if (!res) {
+ ZM_DEBUG(zm_dump(__LINE__));
+ return xyzModem_timeout;
+ }
+ res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.cblk);
+ ZM_DEBUG(zm_save(xyz.cblk));
+ if (!res) {
+ ZM_DEBUG(zm_dump(__LINE__));
+ return xyzModem_timeout;
+ }
+ xyz.len = (c == SOH) ? 128 : 1024;
+ xyz.bufp = xyz.pkt;
+ for (i = 0; i < xyz.len; i++) {
+ res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &c);
+ ZM_DEBUG(zm_save(c));
+ if (res) {
+ xyz.pkt[i] = c;
+ } else {
+ ZM_DEBUG(zm_dump(__LINE__));
+ return xyzModem_timeout;
+ }
+ }
+ res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.crc1);
+ ZM_DEBUG(zm_save(xyz.crc1));
+ if (!res) {
+ ZM_DEBUG(zm_dump(__LINE__));
+ return xyzModem_timeout;
+ }
+ if (xyz.crc_mode) {
+ res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.crc2);
+ ZM_DEBUG(zm_save(xyz.crc2));
+ if (!res) {
+ ZM_DEBUG(zm_dump(__LINE__));
+ return xyzModem_timeout;
+ }
+ }
+ ZM_DEBUG(zm_dump(__LINE__));
+ // Validate the message
+ if ((xyz.blk ^ xyz.cblk) != (unsigned char)0xFF) {
+ ZM_DEBUG(zm_dprintf("Framing error - blk: %x/%x/%x\n", xyz.blk, xyz.cblk, (xyz.blk ^ xyz.cblk)));
+ ZM_DEBUG(zm_dump_buf(xyz.pkt, xyz.len));
+ xyzModem_flush();
+ return xyzModem_frame;
+ }
+ // Verify checksum/CRC
+ if (xyz.crc_mode) {
+ cksum = cyg_crc16(xyz.pkt, xyz.len);
+ if (cksum != ((xyz.crc1 << 8) | xyz.crc2)) {
+ ZM_DEBUG(zm_dprintf("CRC error - recvd: %02x%02x, computed: %x\n",
+ xyz.crc1, xyz.crc2, cksum & 0xFFFF));
+ return xyzModem_cksum;
+ }
+ } else {
+ cksum = 0;
+ for (i = 0; i < xyz.len; i++) {
+ cksum += xyz.pkt[i];
+ }
+ if (xyz.crc1 != (cksum & 0xFF)) {
+ ZM_DEBUG(zm_dprintf("Checksum error - recvd: %x, computed: %x\n", xyz.crc1, cksum & 0xFF));
+ return xyzModem_cksum;
+ }
+ }
+ // If we get here, the message passes [structural] muster
+ return 0;
+}
+
+int
+xyzModem_stream_open(connection_info_t *info, int *err)
+{
+ int console_chan, stat=0;
+ int retries = xyzModem_MAX_RETRIES;
+ int crc_retries = xyzModem_MAX_RETRIES_WITH_CRC;
+
+// ZM_DEBUG(zm_out = zm_out_start);
+#ifdef xyzModem_zmodem
+ if (info->mode == xyzModem_zmodem) {
+ *err = xyzModem_noZmodem;
+ return -1;
+ }
+#endif
+
+#ifdef REDBOOT
+ // Set up the I/O channel. Note: this allows for using a different port in the future
+ console_chan = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
+ if (info->chan >= 0) {
+ CYGACC_CALL_IF_SET_CONSOLE_COMM(info->chan);
+ } else {
+ CYGACC_CALL_IF_SET_CONSOLE_COMM(console_chan);
+ }
+ xyz.__chan = CYGACC_CALL_IF_CONSOLE_PROCS();
+
+ CYGACC_CALL_IF_SET_CONSOLE_COMM(console_chan);
+ CYGACC_COMM_IF_CONTROL(*xyz.__chan, __COMMCTL_SET_TIMEOUT, xyzModem_CHAR_TIMEOUT);
+#else
+// TODO: CHECK !
+ int dummy;
+ xyz.__chan=&dummy;
+#endif
+ xyz.len = 0;
+ xyz.crc_mode = true;
+ xyz.at_eof = false;
+ xyz.tx_ack = false;
+ xyz.mode = info->mode;
+ xyz.total_retries = 0;
+ xyz.total_SOH = 0;
+ xyz.total_STX = 0;
+ xyz.total_CAN = 0;
+#ifdef USE_YMODEM_LENGTH
+ xyz.read_length = 0;
+ xyz.file_length = 0;
+#endif
+
+ CYGACC_COMM_IF_PUTC(*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
+
+ if (xyz.mode == xyzModem_xmodem) {
+ // X-modem doesn't have an information header - exit here
+ xyz.next_blk = 1;
+ return 0;
+ }
+
+ while (retries-- > 0) {
+ stat = xyzModem_get_hdr();
+ if (stat == 0) {
+ // Y-modem file information header
+ if (xyz.blk == 0) {
+#ifdef USE_YMODEM_LENGTH
+ // skip filename
+ while (*xyz.bufp++);
+ // get the length
+ parse_num(xyz.bufp, &xyz.file_length, NULL, " ");
+#endif
+ // The rest of the file name data block quietly discarded
+ xyz.tx_ack = true;
+ }
+ xyz.next_blk = 1;
+ xyz.len = 0;
+ return 0;
+ } else
+ if (stat == xyzModem_timeout) {
+ if (--crc_retries <= 0) xyz.crc_mode = false;
+ CYGACC_CALL_IF_DELAY_US(5*100000); // Extra delay for startup
+ CYGACC_COMM_IF_PUTC(*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
+ xyz.total_retries++;
+ ZM_DEBUG(zm_dprintf("NAK (%d)\n", __LINE__));
+ }
+ if (stat == xyzModem_cancel) {
+ break;
+ }
+ }
+ *err = stat;
+ ZM_DEBUG(zm_flush());
+ return -1;
+}
+
+int
+xyzModem_stream_read(char *buf, int size, int *err)
+{
+ int stat, total, len;
+ int retries;
+
+ total = 0;
+ stat = xyzModem_cancel;
+ // Try and get 'size' bytes into the buffer
+ while (!xyz.at_eof && (size > 0)) {
+ if (xyz.len == 0) {
+ retries = xyzModem_MAX_RETRIES;
+ while (retries-- > 0) {
+ stat = xyzModem_get_hdr();
+ if (stat == 0) {
+ if (xyz.blk == xyz.next_blk) {
+ xyz.tx_ack = true;
+ ZM_DEBUG(zm_dprintf("ACK block %d (%d)\n", xyz.blk, __LINE__));
+ xyz.next_blk = (xyz.next_blk + 1) & 0xFF;
+
+#if defined(xyzModem_zmodem) || defined(USE_YMODEM_LENGTH)
+ if (xyz.mode == xyzModem_xmodem || xyz.file_length == 0) {
+#else
+ if (1) {
+#endif
+ // Data blocks can be padded with ^Z (EOF) characters
+ // This code tries to detect and remove them
+ if ((xyz.bufp[xyz.len-1] == EOF) &&
+ (xyz.bufp[xyz.len-2] == EOF) &&
+ (xyz.bufp[xyz.len-3] == EOF)) {
+ while (xyz.len && (xyz.bufp[xyz.len-1] == EOF)) {
+ xyz.len--;
+ }
+ }
+ }
+
+#ifdef USE_YMODEM_LENGTH
+ // See if accumulated length exceeds that of the file.
+ // If so, reduce size (i.e., cut out pad bytes)
+ // Only do this for Y-modem (and Z-modem should it ever
+ // be supported since it can fall back to Y-modem mode).
+ if (xyz.mode != xyzModem_xmodem && 0 != xyz.file_length) {
+ xyz.read_length += xyz.len;
+ if (xyz.read_length > xyz.file_length) {
+ xyz.len -= (xyz.read_length - xyz.file_length);
+ }
+ }
+#endif
+ break;
+ } else if (xyz.blk == ((xyz.next_blk - 1) & 0xFF)) {
+ // Just re-ACK this so sender will get on with it
+ CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
+ continue; // Need new header
+ } else {
+ stat = xyzModem_sequence;
+ }
+ }
+ if (stat == xyzModem_cancel) {
+ break;
+ }
+ if (stat == xyzModem_eof) {
+ CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
+ ZM_DEBUG(zm_dprintf("ACK (%d)\n", __LINE__));
+ if (xyz.mode == xyzModem_ymodem) {
+ CYGACC_COMM_IF_PUTC(*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
+ xyz.total_retries++;
+ ZM_DEBUG(zm_dprintf("Reading Final Header\n"));
+ stat = xyzModem_get_hdr();
+ CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
+ ZM_DEBUG(zm_dprintf("FINAL ACK (%d)\n", __LINE__));
+ }
+ xyz.at_eof = true;
+ break;
+ }
+ CYGACC_COMM_IF_PUTC(*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
+ xyz.total_retries++;
+ ZM_DEBUG(zm_dprintf("NAK (%d)\n", __LINE__));
+ }
+ if (stat < 0) {
+ *err = stat;
+ xyz.len = -1;
+ return total;
+ }
+ }
+ // Don't "read" data from the EOF protocol package
+ if (!xyz.at_eof) {
+ len = xyz.len;
+ if (size < len) len = size;
+ memcpy(buf, xyz.bufp, len);
+ size -= len;
+ buf += len;
+ total += len;
+ xyz.len -= len;
+ xyz.bufp += len;
+ }
+ }
+ return total;
+}
+
+void
+xyzModem_stream_close(int *err)
+{
+ diag_printf("xyzModem - %s mode, %d(SOH)/%d(STX)/%d(CAN) packets, %d retries\n",
+ xyz.crc_mode ? "CRC" : "Cksum",
+ xyz.total_SOH, xyz.total_STX, xyz.total_CAN,
+ xyz.total_retries);
+ ZM_DEBUG(zm_flush());
+}
+
+// Need to be able to clean out the input buffer, so have to take the
+// getc
+void xyzModem_stream_terminate(bool abort, int (*getc)(void))
+{
+ int c;
+
+ if (abort) {
+ ZM_DEBUG(zm_dprintf("!!!! TRANSFER ABORT !!!!\n"));
+ switch (xyz.mode) {
+ case xyzModem_xmodem:
+ case xyzModem_ymodem:
+ // The X/YMODEM Spec seems to suggest that multiple CAN followed by an equal
+ // number of Backspaces is a friendly way to get the other end to abort.
+ CYGACC_COMM_IF_PUTC(*xyz.__chan,CAN);
+ CYGACC_COMM_IF_PUTC(*xyz.__chan,CAN);
+ CYGACC_COMM_IF_PUTC(*xyz.__chan,CAN);
+ CYGACC_COMM_IF_PUTC(*xyz.__chan,CAN);
+ CYGACC_COMM_IF_PUTC(*xyz.__chan,BSP);
+ CYGACC_COMM_IF_PUTC(*xyz.__chan,BSP);
+ CYGACC_COMM_IF_PUTC(*xyz.__chan,BSP);
+ CYGACC_COMM_IF_PUTC(*xyz.__chan,BSP);
+ // Now consume the rest of what's waiting on the line.
+ ZM_DEBUG(zm_dprintf("Flushing serial line.\n"));
+ xyzModem_flush();
+ xyz.at_eof = true;
+ break;
+#ifdef xyzModem_zmodem
+ case xyzModem_zmodem:
+ // Might support it some day I suppose.
+#endif
+ break;
+ }
+ } else {
+ ZM_DEBUG(zm_dprintf("Engaging cleanup mode...\n"));
+ // Consume any trailing crap left in the inbuffer from
+ // previous recieved blocks. Since very few files are an exact multiple
+ // of the transfer block size, there will almost always be some gunk here.
+ // If we don't eat it now, RedBoot will think the user typed it.
+ ZM_DEBUG(zm_dprintf("Trailing gunk:\n"));
+ while ((c = (*getc)()) > -1) ;
+ ZM_DEBUG(zm_dprintf("\n"));
+ // Make a small delay to give terminal programs like minicom
+ // time to get control again after their file transfer program
+ // exits.
+ CYGACC_CALL_IF_DELAY_US((cyg_int32)250000);
+ }
+}
+
+char *
+xyzModem_error(int err)
+{
+ switch (err) {
+ case xyzModem_access:
+ return "Can't access file";
+ break;
+ case xyzModem_noZmodem:
+ return "Sorry, zModem not available yet";
+ break;
+ case xyzModem_timeout:
+ return "Timed out";
+ break;
+ case xyzModem_eof:
+ return "End of file";
+ break;
+ case xyzModem_cancel:
+ return "Cancelled";
+ break;
+ case xyzModem_frame:
+ return "Invalid framing";
+ break;
+ case xyzModem_cksum:
+ return "CRC/checksum error";
+ break;
+ case xyzModem_sequence:
+ return "Block sequence error";
+ break;
+ default:
+ return "Unknown error";
+ break;
+ }
+}
+
+//
+// RedBoot interface
+//
+#if 0 // SB
+GETC_IO_FUNCS(xyzModem_io, xyzModem_stream_open, xyzModem_stream_close,
+ xyzModem_stream_terminate, xyzModem_stream_read, xyzModem_error);
+RedBoot_load(xmodem, xyzModem_io, false, false, xyzModem_xmodem);
+RedBoot_load(ymodem, xyzModem_io, false, false, xyzModem_ymodem);
+#endif
