Re: [U-Boot-Users] boot up u-boot from RAM
Lei,
You have to rebuild your code to put your code in the RAM area (other than the FLASH area). Don't use the address 0x00-0x2fff because its reserved for the exception vectors usually. I have a Lite5200 EVB. I use the address 0x20000 to put my u-boot in RAM and it works. I don't know if it could be done for the mpc8270.
Tien
-----Original Message----- From: u-boot-users-bounces@lists.sourceforge.net [mailto:u-boot-users-bounces@lists.sourceforge.net]On Behalf Of Lei Sun Sent: Thursday, October 26, 2006 4:15 PM To: u-boot-users@lists.sourceforge.net Subject: [U-Boot-Users] boot up u-boot from RAM
Hi all: I am debugging a costomized board based on mpc8270, due to the design flaw, we can't boot up the system using flash, so I was trying to debug u-boot by loading it into the RAM. I used JTAG debugger to initialize the SDRAM and load the u-boot to 0x0, after reset, the PC is at 0x100. the disassembled code looks correct on that location, however, i can't single step start from 0x100. Is that because 0x100 is the reset vector ? I tried to put some breakpoint at some places not far from start point, but it gave me "unknown halt at 0x00000000" error after "run" command. after that the memory seems corrupted. Too bad I was using a bad debugger(Guardian-SE), I have a evaluation copy of the codewarrior plus USB+TAP from freescale. I tried that on our PQ2FADS-VR SDK. After reset, and CPU halt, I can't see any disassembed code on 0x100 (the uboot is already in the flash, and I assume it should read data from CS0 upon reset). Although the code does execute after hitting "run" button. I wonder why can't I see the disassembed code after reset?
Thanks lei
------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&da... _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
I did build my code to 0x0 (TEXT_BASE=0x0). Your explaination does make some sense, but what i don't understand is that upon reset, PC jump to reset vector 0x100, does it need a valid instruction on 0x100 to exectute, so why couldn't I single step start from this location? Have you ever tried to put the code to 0x0 instead ? It didn't work? Why would it work if in the flash? in that case the the initial portion of the flash is also for exeption vectors.
On 10/26/06, Nghiem, Tien TNghiem@oerlikon.ca wrote:
Lei,
You have to rebuild your code to put your code in the RAM area (other than the FLASH area). Don't use the address 0x00-0x2fff because its reserved for the exception vectors usually. I have a Lite5200 EVB. I use the address 0x20000 to put my u-boot in RAM and it works. I don't know if it could be done for the mpc8270.
Tien
-----Original Message----- From: u-boot-users-bounces@lists.sourceforge.net [mailto:u-boot-users-bounces@lists.sourceforge.net]On Behalf Of Lei Sun Sent: Thursday, October 26, 2006 4:15 PM To: u-boot-users@lists.sourceforge.net Subject: [U-Boot-Users] boot up u-boot from RAM
Hi all: I am debugging a costomized board based on mpc8270, due to the design flaw, we can't boot up the system using flash, so I was trying to debug u-boot by loading it into the RAM. I used JTAG debugger to initialize the SDRAM and load the u-boot to 0x0, after reset, the PC is at 0x100. the disassembled code looks correct on that location, however, i can't single step start from 0x100. Is that because 0x100 is the reset vector ? I tried to put some breakpoint at some places not far from start point, but it gave me "unknown halt at 0x00000000" error after "run" command. after that the memory seems corrupted. Too bad I was using a bad debugger(Guardian-SE), I have a evaluation copy of the codewarrior plus USB+TAP from freescale. I tried that on our PQ2FADS-VR SDK. After reset, and CPU halt, I can't see any disassembed code on 0x100 (the uboot is already in the flash, and I assume it should read data from CS0 upon reset). Although the code does execute after hitting "run" button. I wonder why can't I see the disassembed code after reset?
Thanks lei
Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&da... _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
Hi lee, I am using lite5200 and Ihave dowaload uboot IT was working perfect, but I got the usb tap and the Code warrior. my problems are : USB tab does not comminicate with the board . and I donot know if uboot goes with code warrior thanks
Nghiem, Tien wrote:
Lei,
You have to rebuild your code to put your code in the RAM area (other than the FLASH area). Don't use the address 0x00-0x2fff because its reserved for the exception vectors usually. I have a Lite5200 EVB. I use the address 0x20000 to put my u-boot in RAM and it works. I don't know if it could be done for the mpc8270.
Tien
-----Original Message----- From: u-boot-users-bounces@lists.sourceforge.net [mailto:u-boot-users-bounces@lists.sourceforge.net]On Behalf Of Lei Sun Sent: Thursday, October 26, 2006 4:15 PM To: u-boot-users@lists.sourceforge.net Subject: [U-Boot-Users] boot up u-boot from RAM
Hi all: I am debugging a costomized board based on mpc8270, due to the design flaw, we can't boot up the system using flash, so I was trying to debug u-boot by loading it into the RAM. I used JTAG debugger to initialize the SDRAM and load the u-boot to 0x0, after reset, the PC is at 0x100. the disassembled code looks correct on that location, however, i can't single step start from 0x100. Is that because 0x100 is the reset vector ? I tried to put some breakpoint at some places not far from start point, but it gave me "unknown halt at 0x00000000" error after "run" command. after that the memory seems corrupted. Too bad I was using a bad debugger(Guardian-SE), I have a evaluation copy of the codewarrior plus USB+TAP from freescale. I tried that on our PQ2FADS-VR SDK. After reset, and CPU halt, I can't see any disassembed code on 0x100 (the uboot is already in the flash, and I assume it should read data from CS0 upon reset). Although the code does execute after hitting "run" button. I wonder why can't I see the disassembed code after reset?
Thanks lei
Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&da... _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&da... _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
In message 13948771.post@talk.nabble.com you wrote:
Hi lee, I am using lite5200 and Ihave dowaload uboot IT was working perfect, but I got the usb tap and the Code warrior. my problems are : USB tab does not comminicate with the board . and I donot know if uboot goes with code warrior
Lamej, you are violating a lot of pretty basic netiquette rules all at once.
Don't top post / full quote.
Don't reply to completely unrelated messages when in fact you want to start a new thread.
Don't ask off topic questions.
And read the FAQ before posting: http://www.denx.de/wiki/view/DULG/CanUBootBeConfiguredSuchThatItCanBeStarted...
You may also want to read http://www.netmeister.org/news/learn2quote.html and http://catb.org/esr/faqs/smart-questions.html
Wolfgang Denk
participants (4)
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lamej -
Lei Sun -
Nghiem, Tien -
Wolfgang Denk