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電子工作シリーズ。SH2 マイコンに SDカード(MMC) I/F を用意した。MP3 デコーダを付けてから、表向きはあまり進展のなかったのだけど、gcc/gdb 開発環境の準備などに手間取っていた次第。
SD カードのテストには「フラッシュ・メモリ・カードの徹底活用」掲載サンプルプログラムを gdb モニタ用に小修正したものを使った。SH2 基板上の RS232C(SCI1) はデバッグモニタで使用するため、ターゲットプログラムでの入出力用のシリアルインターフェース SCI0 を引き出している。残った SCI2 を SD カード入出力に使う。
テストに用いた 512M SD カードでは次のような情報が得られた。
MMC Access sample program CID = 04 53 44 53 44 35 31 32 24 00 E0 1A 27 00 67 9D Manufacturer ID : 04h OEM/Application ID : 5344h Product Name : 'SD512$' Product Revision : 00h Product Serial Number : E01A2700h Manufacturing Date : 67h CRC : 9Dh CSD = 00 5D 00 32 1B 59 83 CC F6 DB 41 BF 16 40 00 2D MMC Spec Verison = 0 C_SIZE_MULT = 6 C_SIZE = 3891 MULT = 256 BLOCK_LEN = 512 MAX LBA = 996352
セクタ 0 の内容。FAT ファイルシステムについては「FAT FS フォーマットの実装についての覚え書き」[KabaVM System] に詳しい。
LBA=0~0 Read Sector Count = 1 +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F | ---- ASCII ----- 000h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 010h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 020h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 030h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 040h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 050h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 060h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 070h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 080h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 090h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 0A0h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 0B0h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 0C0h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 0D0h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 0E0h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 0F0h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 100h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 110h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 120h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 130h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 140h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 150h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 160h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 170h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 180h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 190h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 1A0h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 1B0h 00 00 00 00 00 00 00 00 - 7A 90 03 06 00 00 00 03 | ........z....... 1C0h 2F 00 0B 07 C7 DC EB 00 - 00 00 15 33 0F 00 00 00 | /..........3.... 1D0h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 1E0h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 1F0h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 55 AA | ..............U.
で、こちらが最初のパーティションの BPB (Boot Parameter Block)。当初、セクタ 0 に BPB があるものだと思い込んでいて悩んでしまった。組込み用の汎用 FAT ファイルシステムを載せる場合に、パーティション管理は自前でおこなう必要がある。
Posted by masato at 07:25 AMLBA=235~235 Read Sector Count = 1 +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F | ---- ASCII ----- 000h EB 58 90 4D 53 44 4F 53 - 35 2E 30 00 02 08 22 00 | .X.MSDOS5.0...". 010h 02 00 00 00 00 F8 00 00 - 3F 00 FF 00 EB 00 00 00 | ........?....... 020h 15 33 0F 00 CB 03 00 00 - 00 00 00 00 02 00 00 00 | .3.............. 030h 01 00 06 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 040h 00 00 29 D1 57 B6 F8 4E - 4F 20 4E 41 4D 45 20 20 | ..).W..NO NAME 050h 20 20 46 41 54 33 32 20 - 20 20 33 C9 8E D1 BC F4 | FAT32 3..... 060h 7B 8E C1 8E D9 BD 00 7C - 88 4E 02 8A 56 40 B4 08 | {......|.N..V@.. 070h CD 13 73 05 B9 FF FF 8A - F1 66 0F B6 C6 40 66 0F | ..s......f...@f. 080h B6 D1 80 E2 3F F7 E2 86 - CD C0 ED 06 41 66 0F B7 | ....?.......Af.. 090h C9 66 F7 E1 66 89 46 F8 - 83 7E 16 00 75 38 83 7E | .f..f.F..~..u8.~ 0A0h 2A 00 77 32 66 8B 46 1C - 66 83 C0 0C BB 00 80 B9 | *.w2f.F.f....... 0B0h 01 00 E8 2B 00 E9 48 03 - A0 FA 7D B4 7D 8B F0 AC | ...+..H...}.}... 0C0h 84 C0 74 17 3C FF 74 09 - B4 0E BB 07 00 CD 10 EB | ..t.<.t......... 0D0h EE A0 FB 7D EB E5 A0 F9 - 7D EB E0 98 CD 16 CD 19 | ...}....}....... 0E0h 66 60 66 3B 46 F8 0F 82 - 4A 00 66 6A 00 66 50 06 | f`f;F...J.fj.fP. 0F0h 53 66 68 10 00 01 00 80 - 7E 02 00 0F 85 20 00 B4 | Sfh.....~.... .. 100h 41 BB AA 55 8A 56 40 CD - 13 0F 82 1C 00 81 FB 55 | A..U.V@........U 110h AA 0F 85 14 00 F6 C1 01 - 0F 84 0D 00 FE 46 02 B4 | .............F.. 120h 42 8A 56 40 8B F4 CD 13 - B0 F9 66 58 66 58 66 58 | B.V@......fXfXfX 130h 66 58 EB 2A 66 33 D2 66 - 0F B7 4E 18 66 F7 F1 FE | fX.*f3.f..N.f... 140h C2 8A CA 66 8B D0 66 C1 - EA 10 F7 76 1A 86 D6 8A | ...f..f....v.... 150h 56 40 8A E8 C0 E4 06 0A - CC B8 01 02 CD 13 66 61 | V@............fa 160h 0F 82 54 FF 81 C3 00 02 - 66 40 49 0F 85 71 FF C3 | ..T.....f@I..q.. 170h 4E 54 4C 44 52 20 20 20 - 20 20 20 00 00 00 00 00 | NTLDR ..... 180h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 190h 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | ................ 1A0h 00 00 00 00 00 00 00 00 - 00 00 00 00 0D 0A 52 65 | ..............Re 1B0h 6D 6F 76 65 20 64 69 73 - 6B 73 20 6F 72 20 6F 74 | move disks or ot 1C0h 68 65 72 20 6D 65 64 69 - 61 2E FF 0D 0A 44 69 73 | her media....Dis 1D0h 6B 20 65 72 72 6F 72 FF - 0D 0A 50 72 65 73 73 20 | k error...Press 1E0h 61 6E 79 20 6B 65 79 20 - 74 6F 20 72 65 73 74 61 | any key to resta 1F0h 72 74 0D 0A 00 00 00 00 - 00 AC CB D8 00 00 55 AA | rt............U.
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