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NAND: Completely rewrite software ECC. A modest code increase (about 500 bytes) is a small price to pay for a massive speedup (measured at 3x on lpc2468, 21x on AMD64 on the desktop...)
author Ross Younger <wry@ecoscentric.com>
date Fri, 06 Nov 2009 17:52:17 +0000
parents 56aff9481398
children b3d2f083ab91
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2963
b836edcc5d76 NAND: Completely rewrite software ECC. A modest code increase (about 500 bytes) is a small price to pay for a massive speedup (measured at 3x on lpc2468, 21x on AMD64 on the desktop...)
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parents: 2952
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1 2009-11-06 Ross Younger <wry@eCosCentric.com>
b836edcc5d76 NAND: Completely rewrite software ECC. A modest code increase (about 500 bytes) is a small price to pay for a massive speedup (measured at 3x on lpc2468, 21x on AMD64 on the desktop...)
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2
b836edcc5d76 NAND: Completely rewrite software ECC. A modest code increase (about 500 bytes) is a small price to pay for a massive speedup (measured at 3x on lpc2468, 21x on AMD64 on the desktop...)
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3 * nand_ecc_mtd_fast.c: Created. Complete rewrite of software
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4 ECC for massive performance boost. In summary, use all 32 bits
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5 of a register at once, and part-unroll the operation. (Also
b836edcc5d76 NAND: Completely rewrite software ECC. A modest code increase (about 500 bytes) is a small price to pay for a massive speedup (measured at 3x on lpc2468, 21x on AMD64 on the desktop...)
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6 rewrote the ecc repair function to drop the dependency on the
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7 previous (imported) code.
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8 * tests: Update to suit the above.
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0eb1d8b14623 NAND: update doc for recent changes; document ECC alg interface
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10 2009-10-28 Ross Younger <wry@eCosCentric.com>
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f14749d39b9c NAND: implement CYGSEM_IO_NAND_USE_BBT
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f14749d39b9c NAND: implement CYGSEM_IO_NAND_USE_BBT
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12 * nand.cdl, nand.c, nand_bbt.[ch]: CYGSEM_IO_NAND_USE_BBT
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13 implemented (default on). Updated tests and utils to suit.
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b72667909323 NAND: add CYGBLD_IO_NAND_BUILD_UTILS; tidy bbt code
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14 * nand.cdl: Add convenience options to build the utils as well
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15 as the tests.
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cde493f78168 NAND: add sweccwalk test
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16 * tests/sweccwalk.c: Created (software ECC bit-walker and repair
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17 consistency checks)
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18 * nand.sgml: Updated for the above. Documented ECC algorithm
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19 interface.
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20 * tests/rwbenchmark.c: Have rwbenchmark use randomised test data
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21 and check its work for better validity.
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23 2009-10-08 Ross Younger <wry@eCosCentric.com>
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25 * nand_ecc.h, nand.c, nand_ecc_mtd.c: Expand ECC interface
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26 to better allow hardware assistance.
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27 * nand_device.h, nand.cdl: Change function set ("v2"), add cdl marker
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28 * nand.c: Implement v2 read/write, updated devinit
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29 * nand.c, nand_bbt.h: Internally expose "raw" page read/write fns
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30 * nand_oob.c, nand_oob.h: Create packed_{read,write} fns
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31 * nand_bbt.c: Use raw page read/write fns, packed read/write fns
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32 - and sanity test them on startup
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33 * nand.sgml: Document driver interface change.
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34 * rwbenchmark.c: Check that we read the requisite amount of data.
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cc87500cad3c NAND/synth tests: Don't put large arrays on stack. (#1000826)
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36 2009-09-28 Ross Younger <wry@eCosCentric.com>
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37
cc87500cad3c NAND/synth tests: Don't put large arrays on stack. (#1000826)
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38 * tests: Don't put large arrays on stack.
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40 2009-08-28 Ross Younger <wry@eCosCentric.com>
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41
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42 * doc/nand.sgml: Update. Split entries for NAND device drivers out into
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43 their individual driver packages.
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44 * tests: Moved bbt.c and multipagebbt.c into devs/nand/synth/
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48 * utils: Add erasenand.c; build fix erase_bbt_dangerous.c
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50 2009-07-21 Ross Younger <wry@eCosCentric.com>
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52 * nand_bbt.c: Fix BBT initialisation bug
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54 2009-07-17 Ross Younger <wry@eCosCentric.com>
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56 * nand.sgml: Prep for inclusion in docbuilds
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60 * nand_bbt.c: Fix corner case arising from a write failure on a BBT block.
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62 2009-07-02 Ross Younger <wry@eCosCentric.com>
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63
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64 * tests: Add rwbenchmark.c
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66 2009-06-17 Ross Younger <wry@eCosCentric.com>
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67 * Global: Create a per-device lock to remove this burden from drivers.
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68 Retab for consistency with the rest of eCos.
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69 * cdl: Create CYGNUM_NAND_PAGEBUFFER; NAND drivers must impose
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70 requirements on this according to the largest device they support.
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71 Add dependency on stdlib.
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72 * nand.c, util.c: Add more assertions.
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73 * nand_app.h: Renamed to nand.h for consistency with other packages
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74 * nand_bbt.c: Refactor to use the pagebuffer to not be so stack-greedy.
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75 Properly incorporate both on-chip BBTs in case we were interrupted
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76 when writing out. Add more assertions.
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77 * nand_bbt.h: Move BLOCK2PAGEADDR and PAGE2BLOCKADDR to util.h.
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78 Header made internal.
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79 * nand_ecc.h: Rename ECCPERPAGE to CYG_NAND_ECCPERPAGE.
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80 * nand_oob.h: Rename NAND_APPLICATION_OOB to CYG_NAND_APPLICATION_OOB,
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81 similarly for OOB_MAX_ECC_SLOTS and OOB_MAX_APP_SLOTS.
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82 * doc: Linewrap for consistency
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83 * tests: Tweak to make more likely to work in a minimal config.
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84 Move mkvector.c and ar4test.c into misc/.
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85 bbt doesn't mandate synth.
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86 eccdamage moved to synth.
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87
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88 2009-06-02 Ross Younger <wry@eCosCentric.com>
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89
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90 * cyg_nand_init: Removed in toto, in favour of a static constructor.
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91 * Global: Replaced all use of diag_printf with new NAND_ERROR macro.
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92
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93 2009-06-01 Ross Younger <wry@eCosCentric.com>
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94
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95 * src/util.c include/util.h: Created
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96
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97 2009-03-02 Ross Younger <wry@eCosCentric.com>
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98
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99 * New package. NAND flash access library.
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100
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101 //===========================================================================
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102 // ####ECOSGPLCOPYRIGHTBEGIN####
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103 // -------------------------------------------
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104 // This file is part of eCos, the Embedded Configurable Operating System.
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105 // Copyright (C) 2009 eCosCentric Limited.
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106 //
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107 // eCos is free software; you can redistribute it and/or modify it under
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108 // the terms of the GNU General Public License as published by the Free
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109 // Software Foundation; either version 2 or (at your option) any later
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110 // version.
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111 //
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112 // eCos is distributed in the hope that it will be useful, but WITHOUT
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113 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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114 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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115 // for more details.
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116 //
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117 // You should have received a copy of the GNU General Public License
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118 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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119 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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120 //
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121 // As a special exception, if other files instantiate templates or use
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122 // macros or inline functions from this file, or you compile this file
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123 // and link it with other works to produce a work based on this file,
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124 // this file does not by itself cause the resulting work to be covered by
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125 // the GNU General Public License. However the source code for this file
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126 // must still be made available in accordance with section (3) of the GNU
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127 // General Public License v2.
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128 //
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129 // This exception does not invalidate any other reasons why a work based
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130 // on this file might be covered by the GNU General Public License.
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131 // -------------------------------------------
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132 // ####ECOSGPLCOPYRIGHTEND####
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133 //===========================================================================
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134
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135