new file mode 100644
--- /dev/null
+++ b/packages/redboot/current/src/xyzModem.c
@@ -0,0 +1,358 @@
+//==========================================================================
+//
+//      xyzModem.c
+//
+//      RedBoot stream handler for xyzModem protocol
+//
+//==========================================================================
+//####COPYRIGHTBEGIN####
+//                                                                          
+// -------------------------------------------                              
+// The contents of this file are subject to the Red Hat eCos Public License 
+// Version 1.1 (the "License"); you may not use this file except in         
+// compliance with the License.  You may obtain a copy of the License at    
+// http://www.redhat.com/                                                   
+//                                                                          
+// Software distributed under the License is distributed on an "AS IS"      
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
+// License for the specific language governing rights and limitations under 
+// the License.                                                             
+//                                                                          
+// The Original Code is eCos - Embedded Configurable Operating System,      
+// released September 30, 1998.                                             
+//                                                                          
+// The Initial Developer of the Original Code is Red Hat.                   
+// Portions created by Red Hat are                                          
+// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
+// All Rights Reserved.                                                     
+// -------------------------------------------                              
+//                                                                          
+//####COPYRIGHTEND####
+//==========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):    gthomas
+// Contributors: gthomas
+// Date:         2000-07-14
+// Purpose:      
+// Description:  
+//              
+// This code is part of RedBoot (tm).
+//
+//####DESCRIPTIONEND####
+//
+//==========================================================================
+
+#include <redboot.h>
+#include <xyzModem.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 NAK 0x15
+#define CAN 0x18
+
+// Data & state local to the protocol
+static struct {
+    hal_virtual_comm_table_t* __chan;
+    unsigned char pkt[1024], *bufp;
+    unsigned char blk,cblk,crc1,crc2;
+    unsigned char next_blk;  // Expected block
+    int len;
+    bool crc_mode, at_eof;
+} xyz;
+
+#define xyzModem_CHAR_TIMEOUT 1000  // 1 second
+#define xyzModem_MAX_RETRIES    20
+
+// Table of CRC constants - implements x^16+x^12+x^5+1
+static unsigned short crc16[] = {
+    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 
+    0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 
+    0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 
+    0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 
+    0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 
+    0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, 
+    0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, 
+    0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 
+    0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, 
+    0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 
+    0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 
+    0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 
+    0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 
+    0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, 
+    0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, 
+    0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, 
+    0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, 
+    0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, 
+    0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 
+    0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 
+    0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 
+    0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 
+    0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, 
+    0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, 
+    0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, 
+    0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, 
+    0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, 
+    0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 
+    0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 
+    0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 
+    0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 
+    0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0, 
+};
+
+void
+zm_dprintf(char *fmt, ...)
+{
+    int cur_console;
+    va_list args;
+
+    va_start(args, fmt);
+    cur_console = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
+    CYGACC_CALL_IF_SET_CONSOLE_COMM(1);
+    vprintf(fmt, args);
+    CYGACC_CALL_IF_SET_CONSOLE_COMM(cur_console);
+}
+
+void
+zm_dump_buf(void *buf, int len)
+{
+    int cur_console;
+
+    cur_console = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
+    CYGACC_CALL_IF_SET_CONSOLE_COMM(1);
+    dump_buf(buf, len);
+    CYGACC_CALL_IF_SET_CONSOLE_COMM(cur_console);
+}
+
+// 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;
+    unsigned short cksum;
+
+    // Find the start of a header
+    while (!hdr_found) {
+        res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &c);
+        if (res) {
+            switch (c) {
+            case SOH:
+            case STX:
+                hdr_found = true;
+                break;
+            case CAN:
+                return xyzModem_cancel;
+            case EOT:
+                return xyzModem_eof;
+            default:
+                // Ignore, waiting for start of header
+            }
+        } else {
+            // Data stream timed out
+            return xyzModem_timeout;
+        }
+    }
+
+    // Header found, now read the data
+    res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.blk);
+    if (!res) {
+        return xyzModem_timeout;
+    }
+    res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.cblk);
+    if (!res) {
+        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);
+        if (res) {
+            xyz.pkt[i] = c;
+        } else {
+            return xyzModem_timeout;
+        }
+    }
+    res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.crc1);
+    if (!res) {
+        return xyzModem_timeout;
+    }
+    if (xyz.crc_mode) {
+        res = CYGACC_COMM_IF_GETC_TIMEOUT(*xyz.__chan, &xyz.crc2);
+        if (!res) {
+            return xyzModem_timeout;
+        }
+    }
+    // Validate the message
+    if ((xyz.blk ^ xyz.cblk) != (unsigned char)0xFF) {
+        zm_dprintf("Framing error - blk: %x/%x/%x\n", xyz.blk, xyz.cblk, (xyz.blk ^ xyz.cblk));
+        zm_dump_buf(xyz.pkt, xyz.len);
+        xyzModem_flush();
+        return xyzModem_frame;
+    }
+    // Verify checksum/CRC
+    if (xyz.crc_mode) {
+        cksum = 0;
+        for (i = 0;  i < xyz.len;  i++) {
+            cksum = crc16[((cksum>>8) ^ xyz.pkt[i]) & 0xFF] ^ (cksum << 8);
+        }
+        if (cksum != ((xyz.crc1 << 8) | xyz.crc2)) {
+            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_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(char *filename, int mode, int *err)
+{
+    int console_chan, stat;
+    int retries = xyzModem_MAX_RETRIES;
+
+    if (mode == xyzModem_zmodem) {
+        *err = xyzModem_noZmodem;
+        return -1;
+    }
+
+    // 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);
+    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);
+    xyz.len = 0;
+    xyz.crc_mode = true;
+    xyz.at_eof = false;
+
+    while (retries-- > 0) {
+        stat = xyzModem_get_hdr();
+        if (stat == 0) {
+            CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
+            // Note: yModem file name data blocks quietly discarded
+            xyz.next_blk = 1;
+            xyz.len = 0;
+            return 0;
+        } else 
+        if (stat == xyzModem_timeout) {
+            CYGACC_CALL_IF_DELAY_US(5*100000);   // Extra delay for startup
+            CYGACC_COMM_IF_PUTC(*xyz.__chan, 'C');
+        }
+    }
+    *err = stat;
+    return -1;
+}
+
+int 
+xyzModem_stream_read(char *buf, int size, int *err)
+{
+    int stat, total, len;
+    int retries;
+
+    total = 0;
+    // 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) {
+                        CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
+                        xyz.next_blk = (xyz.next_blk + 1) & 0xFF;
+                        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_eof) {
+                    CYGACC_COMM_IF_PUTC(*xyz.__chan, ACK);
+                    xyz.at_eof = true;
+                    break;
+                }
+                CYGACC_COMM_IF_PUTC(*xyz.__chan, 'C');
+            }
+            if (stat < 0) {
+                *err = stat;
+                xyz.len = -1;
+                return total;
+            }            
+        }
+        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;
+}
+
+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;
+    }
+}