銆�銆�Boot Loader 灏辨槸鍦�鎿嶄綔绯荤当(t菕ng)鍏�(n猫i)鏍搁亱琛屼箣鍓嶉亱琛岀殑涓�娈靛皬绋嬪簭銆傞�氶亷閫欐灏忕▼搴�锛屾垜鍊戝彲浠ュ垵濮嬪寲纭欢瑷�(sh猫)鍌欍�佸缓绔�鍏�(n猫i)瀛�绌洪枔鐨勬槧灏勫湒锛屽緸鑰屽皣绯荤当(t菕ng)鐨勮粺纭欢鐠�(hu谩n)澧冨付鍒颁竴鍊嬪悎閬╃殑鐙�鎱�(t脿i)锛屼互渚跨偤鏈�绲傝(di脿o)鐢ㄦ搷浣滅郴绲�(t菕ng)鍏�(n猫i)鏍告簴(zh菙n)鍌欏ソ姝ｇ⒑鐨勭挵(hu谩n)澧�銆傞�氬父锛孊oot Loader 鏄毚(y谩n)閲嶅湴渚濊炒浜庣‖浠惰�屽鐝�(xi脿n)鐨�锛岀壒鍒ユ槸鍦ㄥ祵鍏ュ紡涓栫晫銆傚洜姝�锛屽湪宓屽叆寮忎笘鐣岄噷寤虹珛涓�鍊嬮�氱敤鐨� Boot Loader 骞句箮鏄笉鍙兘鐨�銆傜洝绠″姝�锛屾垜鍊�?n猫i)鍖�璞㈡ⅱ瑭�?Boot Loader 姝哥磵鍑轰竴浜涢�氱敤鐨勬蹇典締锛屼互鎸囧皫(d菐o)鐢ㄦ埗鐗瑰畾鐨� Boot Loader 瑷�(sh猫)瑷堣垏瀵︾従(xi脿n)銆�
銆�銆�澶у鏁�(sh霉) Boot Loader 閮藉寘鍚叐绋笉鍚岀殑鎿嶄綔妯″紡锛�"鍟熷嫊鍔犺級"妯″紡鍜�"涓嬭級"妯″紡锛岄�欑ó鍗�(q奴)鍒ュ儏灏嶄簬闁嬬櫦(f膩)浜哄摗鎵嶆湁鎰忕京銆備絾寰炴渶绲傜敤鎴剁殑瑙掑害鐪�锛孊oot Loader 鐨勪綔鐢ㄥ氨鏄敤渚嗗姞杓夋搷浣滅郴绲�(t菕ng)锛岃�屽苟涓嶅瓨鍦ㄦ墍璎傜殑鍟熷嫊鍔犺級妯″紡鑸囦笅杓夊伐浣滄ā寮忕殑鍗�(q奴)鍒�銆� 銆�銆�鍟熷嫊鍔犺級锛圔oot loading锛夋ā寮忥細閫欑ó妯″紡涔熺ū鐐�"鑷富"锛圓utonomous锛夋ā寮�銆備篃鍗� Boot Loader 寰炵洰妯�(bi膩o)姗熶笂鐨勬煇鍊嬪浐鎱�(t脿i)瀛樺劜瑷�(sh猫)鍌欎笂灏囨搷浣滅郴绲�(t菕ng)鍔犺級鍒� RAM 涓亱琛岋紝鏁村�嬮亷绋嬪苟娌掓湁鐢ㄦ埗鐨勪粙鍏�銆傞�欑ó妯″紡鏄� Boot Loader 鐨勬甯稿伐浣滄ā寮�锛屽洜姝ゅ湪宓屽叆寮忕敘(ch菐n)鍝佺櫦(f膩)甯冪殑鏅備警锛孊oot Loader 椤劧蹇呴爤宸ヤ綔鍦ㄩ�欑ó妯″紡涓�銆� 銆�銆�涓嬭級锛圖ownloading锛夋ā寮忥細鍦ㄩ�欑ó妯″紡涓�锛岀洰妯�(bi膩o)姗熶笂鐨� Boot Loader 灏囬�氶亷涓插彛閫ｆ帴鎴栫恫(w菐ng)绲�(lu貌)閫ｆ帴绛夐�氫俊鎵嬫寰炰富姗燂紙Host锛変笅杓夋枃浠�锛屾瘮濡傦細涓嬭級鍏�(n猫i)鏍告槧鍍忓拰鏍规枃浠剁郴绲�(t菕ng)鏄犲儚绛�銆傚緸涓绘涓嬭級鐨勬枃浠堕�氬父棣栧厛琚� Boot Loader 淇濆瓨鍒扮洰妯�(bi膩o)姗熺殑 RAM 涓紝鐒跺悗鍐嶈 Boot Loader 瀵埌鐩(bi膩o)姗熶笂鐨凢LASH 椤炲浐鎱�(t脿i)瀛樺劜瑷�(sh猫)鍌欎腑銆侭oot Loader 鐨勯�欑ó妯″紡閫氬父鍦ㄦ瀹夎鍏�(n猫i)鏍歌垏鏍规枃浠剁郴绲�(t菕ng)鏅傝浣跨敤锛涙澶�锛屼互鍚庣殑绯荤当(t菕ng)鏇存柊涔熸渻浣跨敤 Boot Loader 鐨勯�欑ó宸ヤ綔妯″紡銆傚伐浣滀簬閫欑ó妯″紡涓嬬殑 Boot Loader 閫氬父閮芥渻鍚戝畠鐨勭祩绔敤鎴舵彁渚涗竴鍊嬬啊鍠殑鍛戒护琛屾帴鍙�銆� 銆�銆�鍍� Blob 鎴� U-Boot 绛夐�欐ǎ鍔熻兘寮峰ぇ鐨� Boot Loader 閫氬父鍚屾檪鏀寔閫欏叐绋伐浣滄ā寮忥紝鑰屼笖鍏佽ū鐢ㄦ埗鍦ㄩ�欏叐绋伐浣滄ā寮忎箣闁撻�茶鍒囨彌銆傛瘮濡傦紝Blob 鍦ㄥ暉鍕曟檪铏曚簬姝ｅ父鐨勫暉鍕曞姞杓夋ā寮�锛屼絾鏄畠鏈冨欢鏅� 10 绉掔瓑寰呯祩绔敤鎴舵寜涓嬩换鎰忛嵉鑰屽皣 blob 鍒囨彌鍒颁笅杓夋ā寮忋�傚鏋滃湪 10 绉掑収(n猫i)娌掓湁鐢ㄦ埗鎸夐嵉锛屽墖 blob 绻肩簩(x霉)鍟熷嫊 Linux 鍏�(n猫i)鏍�銆�
銆�銆�姣忕ó涓嶅悓鐨� CPU 楂旂郴绲�(ji茅)妲�(g貌u)閮芥湁涓嶅悓鐨� Boot Loader銆傛湁浜� Boot Loader 涔熸敮鎸佸绋珨绯荤祼(ji茅)妲�(g貌u)鐨� CPU锛屾瘮濡� U-Boot 灏卞悓鏅傛敮鎸� ARM 楂旂郴绲�(ji茅)妲�(g貌u)鍜孧IPS 楂旂郴绲�(ji茅)妲�(g貌u)銆傞櫎浜嗕緷璩翠簬 CPU 鐨勯珨绯荤祼(ji茅)妲�(g貌u)澶栵紝Boot Loader 瀵﹂殯涓婁篃渚濊炒浜庡叿楂旂殑宓屽叆寮忔澘绱氳ō(sh猫)鍌欑殑閰嶇疆銆傞�欎篃灏辨槸瑾�锛屽皪浜庡叐濉婁笉鍚岀殑宓屽叆寮忔澘鑰岃█锛屽嵆浣垮畠鍊戞槸鍩轰簬鍚屼竴绋� CPU 鑰屾(g貌u)寤虹殑锛岃鎯宠畵閬嬭鍦ㄤ竴濉婃澘瀛愪笂鐨� Boot Loader 绋嬪簭涔熻兘閬嬭鍦ㄥ彟涓�濉婃澘瀛愪笂锛岄�氬父涔熼兘闇�瑕佷慨鏀� Boot Loader 鐨勬簮绋嬪簭銆�
銆�銆�绯荤当(t菕ng)鍔犻浕鎴栧京(f霉)浣嶅悗锛屾墍鏈夌殑 CPU 閫氬父閮藉緸鏌愬�嬬敱 CPU 鍒堕�犲晢闋�(y霉)鍏堝畨鎺掔殑鍦板潃涓婂彇鎸囦护銆傛瘮濡�锛屽熀浜� ARM7TDMI core 鐨� CPU 鍦ㄥ京(f霉)浣嶆檪閫氬父閮藉緸鍦板潃 0x00000000 鍙栧畠鐨勬鎸囦护銆傝�屽熀浜� CPU 妲�(g貌u)寤虹殑宓屽叆寮忕郴绲�(t菕ng)閫氬父閮芥湁鏌愮ó椤炲瀷鐨勫浐鎱�(t脿i)瀛樺劜瑷�(sh猫)鍌�(姣斿锛歊OM銆丒EPROM 鎴� FLASH 绛�)琚槧灏勫埌閫欏�嬮爯(y霉)鍏堝畨鎺掔殑鍦板潃涓娿�傚洜姝ゅ湪绯荤当(t菕ng)鍔犻浕鍚�锛孋PU 灏囬鍏堝煼(zh铆)琛� Boot Loader 绋嬪簭銆�
銆�銆�涓嬪湒灏辨槸涓�鍊嬪悓鏅傝鏈� Boot Loader銆佸収(n猫i)鏍哥殑鍟熷嫊鍙冩暩(sh霉)銆佸収(n猫i)鏍告槧鍍忓拰鏍规枃浠剁郴绲�(t菕ng)鏄犲儚鐨勫浐鎱�(t脿i)瀛樺劜瑷�(sh猫)鍌欑殑鍏稿瀷绌洪枔鍒嗛厤绲�(ji茅)妲�(g貌u)鍦�銆�
銆�銆�鍦� 鍥烘厠(t脿i)瀛樺劜瑷�(sh猫)鍌欑殑鍏稿瀷绌洪枔鍒嗛厤绲�(ji茅)妲�(g貌u)
銆�銆�绯荤当(t菕ng)涓婇浕寰�(f霉)浣嶅悗锛� 鍦ㄥ畬鎴愬悇绋垵濮嬪寲閰嶇疆鍚庨鍏堝垽鏂�0x500鍦板潃鍠厓涓�兼槸鍚︾偤0xFF锛� 濡傛灉鏄紝鍓囪鏄庣郴绲�(t菕ng)寰炴湭涓嬭級閬庣敤鎴剁▼搴�锛� 绯荤当(t菕ng)鏈冧竴鐩撮亱琛孊oot loader绋嬪簭绛夊緟PC 姗熺櫦(f膩)閫佷笅杓夊懡浠�锛� 濡傛灉0x500涓殑鍊间笉鏄�0xFF锛� 鍓囪鏄庣郴绲�(t菕ng)涓凡缍�(j墨ng)涓嬭級閬庣敤鎴剁▼搴忎簡锛� 閫欐檪鍊欐牴鎿�(j霉)0x500涓殑鍊间締瑷�(sh猫)缃畾鏅傚櫒T imer2鐨勫垵鍊煎苟闁嬪瑷堟檪锛� 濡傛灉UART2 鍦ㄦ寚瀹氱殑鑷垑鍛ㄦ湡鍏�(n猫i)鏈帴鏀跺埌PC 姗熺櫦(f膩)渚嗙殑涓嬭級鍛戒护(瑾槑绯荤当(t菕ng)涓嶉渶瑕佷笅杓夌▼搴�)锛� 绯荤当(t菕ng)鏈冭嚜鍕曡烦鍑築oo tloader绋嬪簭鑰屽幓閬嬭宸叉湁鐨勭敤鎴朵唬纰�锛� 濡傛灉UART2鍦ㄨ嚜鑸夊懆鏈熷収(n猫i)鎺ユ敹鍒颁簡涓嬭級鍛戒护锛� Boo tloader绋嬪簭鏈冮�插叆寰挵(hu谩n)鐙�鎱�(t脿i)绛夊緟PC姗熺櫦(f膩)閫佹暩(sh霉)鎿�(j霉)銆傚鍦栨墍绀�銆�
銆�銆�鍦� 绋嬪簭娴佺▼鍦�銆�
銆�銆�濡傚墠鏂囨墍杩帮紝 PC 姗熺櫦(f膩)閫佺殑鏁�(sh霉)鎿�(j霉)鏄緸. hex 鏂囦欢涓彁鍙栫殑锛� PC姗熼鍏堢櫦(f膩)閫佹摯灞曞湴鍧�閮ㄥ垎锛� 涓嬩綅姗熸帴鏀朵繚瀛樺悗鏈冪辜绾�(x霉)绛夊緟鎺ユ敹32鍊嬫寚浠ゅ瓧( 96瀛楃瘈(ji茅))骞朵繚瀛樺埌RAM 涓紝 鐒跺悗鏍规摎(j霉)鎺ユ敹鍒扮殑鍦板潃鎿﹂櫎FLASH 瀛樺劜鍣ㄤ腑鐨�1琛�锛� 鎿﹂櫎FLASH 鏄�氶亷瑾�(di脿o)鐢ㄥ尟绶ㄥ嚱鏁�(sh霉)E raseMem渚嗛�茶鐨勶紝 鍑芥暩(sh霉)鍘熷瀷濡備笅:
銆�銆�mov# 0x4041, NVMCON ; 浣縉VMCON 瀵勫瓨鍣ㄧ偤鎿﹂櫎FLASH妯″紡
銆�銆�mov # 0x55, W 0
銆�銆�movW0, NVMKEY
銆�銆�mov # 0xAA, W0
銆�銆�movW 0, NVMKEY ; 灏�0x55銆�0xAA 瀵叆瀵嗛懓瀵勫瓨鍣�
銆�銆�bsetNVMCON, #WR ; 闁嬪鎿﹂櫎
銆�銆�nop
銆�銆�nop
銆�銆�return
銆�銆�鎿﹂櫎FLASH瀛樺劜鍣ㄧ殑涓�琛屽悗闇�瑕佹妸鎺ユ敹鍒扮殑32鍊嬫寚浠ゅ瓧瀵叆鍒癋LASH 瀛樺劜鍣ㄥ閹栧瓨鍣ㄤ腑锛� 閫欎竴閬庣▼鍙互閫氶亷鍑芥暩(sh霉)W riteLatch 瀵︾従(xi脿n)锛� 鍑芥暩(sh霉)鍘熷瀷濡備笅:
銆�銆�movW0, TBLPAG ; 瀵〃瀵勫瓨鍣�
銆�銆�tb lw tlW3, [W1]
銆�銆�tb lw thW2, [W1] ; 瀵叆閹栧瓨鍣�
銆�銆�return
銆�銆�閫欎竴姝ュ畬鎴愪箣鍚庡氨鍙互灏囨帴鏀跺埌鐨�32鍊嬫寚浠ゅ瓧瀵叆FLASH 瀛樺劜鍣ㄤ簡锛� 鍏舵柟娉曡垏鎿﹂櫎FLASH 椤炰技锛� 瀵畬涓�琛屽悗鍚慞C 姗熺櫦(f膩)閫佹噳(y墨ng)绛�銆傚緟FLASH 瀛樺劜鍣ㄥ叏閮ㄥ瀹屼箣鍚庯紝 PC 姗熸渻鐧�(f膩)閫佽〃绀虹祼(ji茅)鏉熶笅杓夌殑鍛戒护锛� 涓嬩綅姗熸帴鏀跺悗閫�鍑築oo tloader绋嬪簭锛� 閫插叆鏂扮殑鐢ㄦ埗绋嬪簭绻肩簩(x霉)閬嬭锛� 寰炶�屽畬鎴愭暣鍊嬪湪绶氳嚜绶ㄧ▼閬庣▼銆�
銆�銆�Bootloader鐩哥暥(d膩ng)浜嶱C涓绘澘涓婄殑B IOS锛� 鏄堡鐨勫紩灏�(d菐o)杌熶欢銆侭oo tloader鏄竴娈靛浐鍖栧湪宓屽叆寮忕郴绲�(t菕ng)鐩(bi膩o)绯荤当(t菕ng)ROM鎴栬�呮槸璜稿FLASH 绛夐潪鏄撳け瀛樺劜鍣ㄤ腑鐨勪竴娈电▼搴忥紝 瀹冪殑涓昏浣滅敤灏辨槸寮曞皫(d菐o)鎿嶄綔绯荤当(t菕ng)鎴栫敤鎴剁▼搴忕殑閬嬭銆傜郴绲�(t菕ng)涓婇浕鍚嶣oo tloader灏囬鍏堟帴绠＄郴绲�(t菕ng)锛� 鍦ㄩ�茶涓�浜涙渶鍩烘湰鐨勪笂闆昏嚜妾㈠悗锛� Bootloader灏囧皪绯荤当(t菕ng)鐨勭‖浠堕�茶鍒濆鍖栵紝 鐐哄紩灏�(d菐o)鎿嶄綔绯荤当(t菕ng)浣滃ソ婧�(zh菙n)鍌�锛� 鎺ヤ笅渚嗭紝 Bootloader闇�瑕佸皣鎿嶄綔绯荤当(t菕ng)鐨勪唬纰兼嫹璨濆埌涓诲瓨鍎插櫒鐨勭壒瀹氬湴鍧�锛� Boot loader灏囨帶鍒舵瑠(qu谩n)浜ょ郸鎿嶄綔绯荤当(t菕ng)锛� 鐢辨搷浣滅郴绲�(t菕ng)瀹屾垚鎺ヤ笅渚嗙殑宸ヤ綔锛涘湪涓嶅惈鎿嶄綔绯荤当(t菕ng)鐨勭郴绲�(t菕ng)涓�锛� Bootloader鍙互瀹屾垚閫欐ǎ涓�浜涙搷浣�: 鍒嗛厤绋嬪簭瀛樺劜绌洪枔锛� 閲嶆柊鏄犲皠寰�(f霉)浣嶅拰涓柗鍚戦噺锛� 灏囩▼搴忎唬纰煎緸鐗囧鍔犺級鍒扮▼搴忓崁(q奴)锛� 鍩�(zh铆)琛屾檪鍐嶅皣浠ｇ⒓鍔犺級鍒癛AM 涓互渚垮揩閫熷煼(zh铆)琛�锛� 妾㈡脯鏄惁闇�瑕佷笅杓夋柊鐨勭敤鎴朵唬纰�锛� 鑻ラ渶瑕佸墖閫氶亷鏌愮ó閫氫俊鏂瑰紡鎺ユ敹鏂颁唬纰煎苟灏囧叾瀵叆鎸囧畾绋嬪簭瀛樺劜绌洪枔涓�锛� 鑻ヤ笉闇�瑕侊紝 鍓囧煼(zh铆)琛屽師鏈夌敤鎴朵唬纰�銆�
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