Add the contrib file for the armv7m arch

Signed-off-by: Jonathan Dumaresq <jdumaresq@cimeq.qc.ca>

diff --git a/contrib/loaders/flash/armv7m_cfi_span_16.s b/contrib/loaders/flash/armv7m_cfi_span_16.s
new file mode 100644 (file)
index 0000000..7a9923f
--- /dev/null
+++ b/contrib/loaders/flash/armv7m_cfi_span_16.s
@@ -0,0 +1,79 @@
+/***************************************************************************
+ *   Copyright (C) 2005, 2007 by Dominic Rath                              *
+ *   Dominic.Rath@gmx.de                                                   *
+ *   Copyright (C) 2010 Spencer Oliver                                     *
+ *   spen@spen-soft.co.uk                                                  *
+ *                                                                         *
+ *   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.             *
+ ***************************************************************************/
+
+       .text
+       .arm
+       .arch armv4
+
+       .section .init
+
+/* input parameters - */
+/*     R0 = source address */
+/*     R1 = destination address */
+/*     R2 = number of writes */
+/*     R3 = flash write command */
+/*     R4 = constant to mask DQ7 bits (also used for Dq5 with shift) */
+/* output parameters - */
+/*     R5 = 0x80 ok 0x00 bad */
+/* temp registers - */
+/*     R6 = value read from flash to test status */
+/*     R7 = holding register */
+/* unlock registers - */
+/*  R8 = unlock1_addr */
+/*  R9 = unlock1_cmd */
+/*  R10 = unlock2_addr */
+/*  R11 = unlock2_cmd */
+
+code:
+       ldrh    r5, [r0], #2
+       strh    r9, [r8]
+       strh    r11, [r10]
+       strh    r3, [r8]
+       strh    r5, [r1]
+       nop
+busy:
+       ldrh    r6, [r1]
+       eor             r7, r5, r6
+       ands    r7, r4, r7
+       beq             cont                    /* b if DQ7 == Data7 */
+       ands    r6, r6, r4, lsr #2
+       beq             busy                    /* b if DQ5 low */
+       ldrh    r6, [r1]
+       eor             r7, r5, r6
+       ands    r7, r4, r7
+       beq             cont                    /* b if DQ7 == Data7 */
+       mov             r5, #0                  /* 0x0 - return 0x00, error */
+       bne             done
+cont:
+       subs    r2, r2, #1              /* 0x1 */
+       beq     success
+       add             r1, r1, #2              /* 0x2 */
+       b               code
+
+success:
+       mov     r5, #128                /* 0x80 */
+       b       done
+
+done:
+       bkpt #0
+
+       .end