JTAG AtlasMgr

D0(PIN2) - TDI; 

D1(PIN3) - TCK; 

D2(PIN4) - TMS; 

BUSY(PIN11) - TDO

1, I have an error to upgrade NBOOT, leading to PR (a "cottage" products, but the open after they have been shocked for its design) and GPS change brick, fully get up, USB is not responding. JTAG experts I am an expert, there are a number of patents can be found on the Internet, developed over JTAG loading and testing of professional hardware and software, a well-known communications companies in the large-scale use (no external sale, please do not ask me such a problem), so determined to own use JTAG to restore. Manufacturers need to first obtain a copy of the corresponding NBOOT EBOOT software, and then there AtlasMgr_GPIO2-6.EXE tool.

2, the GPS a strong, but the information on the Net is very poor, especially the JTAG cable requirements. With HJTAG and WIGGLER cables, to be UNKNOWN devices, not be loaded. But I was special expert, I want to protect their own reputation and the fighting did not reach the purpose of never give up. Here are the steps

3, make sure that chip solution SIRF Centrality ATlas III, AT640. SAMSUNG please self-discovery, I can load, but no one gave me a play.

4, please WINIO.SYS copied to C: \ WINDOWS \ system32 \ drivers directory, and then restart the computer.

5, the GPS, the rear cover open, please note that the warranty label, such as the ability warranty, return the manufacturers recommended maintenance; as saying that the "dead horse like a living horse doctor" attitude, please continue

6, open the GPS back cover, you should be able to see the screen connected to cable, the cable outlet Breaking up can easily remove the cable, please note that cable is relatively weak, to observe a fixed method of cable socket, and then hands-on .

7, then the metal shield, directly forced open shields. My GPS shield is relatively easy to open, I also shield the GPS is also affixed to the top foil, the need should first foil Jiediao's. Do not know whether all this way all the GPS.

8, OK, we can see a 8PIN empty pad, a 2PIN empty pad. Suggest that you obtain a copy of the corresponding vendors to upgrade manual to see if it shows JTAG socket arrangement. My GPS on, 8PIN is J5, 2PIN is J4.

9, 8PIN definition, 1-3.3V; 2-TDO; 3-TMS; 4-TCK; 5-TDI; 6-GND, see Figure

10,8 PIN in, PIN1 in general not the same as with other PIN is a party, so we must distinguish, do not get backward. Can use multimeter volume, PIN6 (GND) whether the shield short-circuit, to determine the order of

11, the wire bonding to the board, I let subordinates to help welding, and I hand wave. JTAG pins, depending on the order with the JTAG cable connection. Note that this JTAG cable is not a WIGGLER or SDT cable (which is a very crucial part of the trial and error to track and then I GOOGLE, looking for a few weeks and finally the corresponding, everyone should be properly grateful to me so solemnly), see Figure

12, JTAG cable parallel port on the computer to see the definition was not clear, and I'll text description: D0 (PIN2)-TDI; D1 (PIN3)-TCK; D2 (PIN4)-TCK; BUSY (PIN11)-TDO. JTAG cable internet many, many, but not the same parallel port definition, do not search on the basis of this definition to produce their own look. (I was specifically developed to load the software and hardware JTAG, we use the CPLD when they have a buffer of products, like how to change line order is OK)

13, start AtlasMgr_GPIO2-6.exe, select JTAG

14, the GPS power, will J4 shorted together, and then AtlasMgr_GPIO2-6 Click Open, and then click to select NBOOT. If prompted to mark the progress bar loaded in progress, if you are prompted error, most likely is no access to JTAG state, long-barrel RESET, J4 open and then take a short (click on Open button and the loading process must be shorted), Press POWER button, press Menu button, the sequence of trial and error and the permutations and combinations of these, I do not know, anyway, accidentally enters the operating state may be JTAG (I have a professional software to know whether it has entered the JTAG state)

15, and finally see the loading progress bar, and tears. Loaded NBOOT, my GPS blue light lit, OK, the wire bonding down, loaded back shielding shell, screen, back cover and so on. The next upgrade EBOOT so you do not need JTAG, and use USB, I will not detail, please see the forum someone else's document (you have to play to the JTAG loaded, USB upgrade is a piece of cake). Note: By USB Load EBOOT, SD card will bring it up. And then behind the upgrade, put the file copied to the SD card, insert, GPS will be automatically upgraded.

16, or would like to remind: Do nothing to upgrade NBOOT, as long as the NBOOT in, how frustrating do not have to open the GPS.