CN1862509A - Method for correcting ROM code in embedded system - Google Patents
Method for correcting ROM code in embedded system Download PDFInfo
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- CN1862509A CN1862509A CN 200510025702 CN200510025702A CN1862509A CN 1862509 A CN1862509 A CN 1862509A CN 200510025702 CN200510025702 CN 200510025702 CN 200510025702 A CN200510025702 A CN 200510025702A CN 1862509 A CN1862509 A CN 1862509A
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Abstract
The present invention discloses a method for modifying ROM code in embedded system. It is characterized by that several comparators are implemented on bus of program, when some comparator output is true, it shows that the function to be modified in current ROM is called, in the interrupt service program the modified function can be called and substituted for function in ROM. Said invention can effectively reduce RAM space used when the ROM code is modified.
Description
Technical field
The present invention relates to the modification and the upgrade technique of firmware code in the embedded system, particularly relate to a kind of amending method of ROM code.
Background technology
The composition of firmware in the embedded system (firmware) code usually is divided into two parts, is put into the ROM district behind a part of code compile, puts the RAM district behind another part code compile into.In the time will making some modification (patch installing), then must put the code that will revise in the ROM district and correlative code recompility in the RAM district into the code in ROM district.The shortcoming of this amending method is, because the RAM in the embedded system is fewer usually, must take more ram space when revising ROM.
Summary of the invention
The technical problem to be solved in the present invention provides the amending method of ROM code in a kind of embedded system, and it can reduce employed ram space when revising ROM.
For solving the problems of the technologies described above, the amending method of ROM code is in the embedded system of the present invention, on the bus of program, realize a plurality of comparers, each comparer comparison be the address of certain function that will revise in current operation address of program and the ROM space, when some comparers are output as true time, system then can stop current program run, and sends and interrupt to system, in interrupt service routine, can call amended function and replace function among the ROM.
Adopt method of the present invention,, illustrate that the function that will revise among the current ROM has been called, in interrupt service routine, can call amended function and replace function among the ROM when some comparers are output as true time.Can effectively reduce employed ram space when revising ROM like this.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and embodiment.
Fig. 1 is traditional method synoptic diagram to the ROM code revision;
Fig. 2 is the realization block diagram to the ROM code revision that the present invention adopts.
Embodiment
Ram space in the embedded system is fewer usually, the objective of the invention is the ram space that uses when revising ROM in order to reduce.
Shown in figure one, to set, there is principal function Main () code area of RAM, and there is function F unc1 () the ROM code area, Func2 (), Func3 ().Assumed function Func3 has problem now, needs patch installing.Traditional way is that a function F unc3_patch () who revises back (after beating patch) proposes to be put into the RAM district from the ROM district, and the function F unc1 of direct and indirect call function F unc3 and Func2 are proposed to be put into the RAM district from the ROM district.Will inevitably take a lot of RAM storage spaces like this, make originally, can not bring into play its due resource effect with regard to less ram space.
In the present invention, on the bus of program, realized a plurality of comparers, each comparer comparison be the address of certain function that will revise in current operation address of program and the ROM space.
As shown in Figure 2, wherein whether the current code operation address Paddr that constantly relatively reads from RAM or ROM of address comparator equals Func3.When it is output as true time, illustrate that the Func3 function has been called among the current ROM, system then can stop current program run, and sends interruption to system.In interrupt service routine, can call amended Func3_patch function and replace Func3 function among the ROM.
Claims (1)
1, the amending method of ROM code in a kind of embedded system, it is characterized in that: on the bus of program, realize a plurality of comparers, each comparer comparison be the address of certain function that will revise in current operation address of program and the ROM space, when some comparers are output as true time, system then can stop current program run, and send to interrupt to system, in interrupt service routine, can call amended function and replace function among the ROM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100257026A CN100371908C (en) | 2005-05-10 | 2005-05-10 | Method for correcting ROM code in embedded system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100257026A CN100371908C (en) | 2005-05-10 | 2005-05-10 | Method for correcting ROM code in embedded system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1862509A true CN1862509A (en) | 2006-11-15 |
| CN100371908C CN100371908C (en) | 2008-02-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100257026A Active CN100371908C (en) | 2005-05-10 | 2005-05-10 | Method for correcting ROM code in embedded system |
Country Status (1)
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| CN (1) | CN100371908C (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6834384B2 (en) * | 2001-03-14 | 2004-12-21 | General Instrument Corporation | Methods and apparatus for upgrading firmware in an embedded system |
| US20030018842A1 (en) * | 2001-07-19 | 2003-01-23 | Donald Harbin | Interrupt controller |
| CN1200341C (en) * | 2002-06-25 | 2005-05-04 | 联想(北京)有限公司 | Method for realizing flush type system firmware program online updating |
| US7089547B2 (en) * | 2002-09-13 | 2006-08-08 | International Business Machines Corporation | Firmware updating |
| US6996673B2 (en) * | 2003-08-21 | 2006-02-07 | International Business Machines Corporation | Method and apparatus for managing inventory and door status during firmware update of an automated data storage library |
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2005
- 2005-05-10 CN CNB2005100257026A patent/CN100371908C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN100371908C (en) | 2008-02-27 |
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Effective date of registration: 20161223 Address after: 361015 Xiamen torch hi tech Zone, Park Park, real estate industry building, Room 201, Fujian Patentee after: Xiamen Ziguang exhibition Rui Technology Co. Ltd. Address before: 201203 Shanghai City Songtao road Pudong Zhangjiang hi tech Park No. 696 3-5 Patentee before: Spreadtrum Communications (Shanghai) Co.,Ltd. |
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