[U-Boot-Users] u-boot hangs after relocating itself to ram
Hey folkes, I have ported u-boot to a custom board based on a freescale mpc5200. I can successfully copy u-boot into flash using the connected bdi2000 and we get some output on the debug port. It seems that the board crashes right after relocation to ram (see output). I already read the regarding faq entry but I'm not sure if this problem has something to do with faulty sdram initialization.
this is the output than comes up on the console:
20030.56> U-Boot 1.1.6-ge4bbd8da-dirty (Nov 27 2006 - 18:46:24) 20030.56> 20030.56> CPU: MPC5200 v1.2, Core v1.1 at 396 MHz 20030.56> Bus 132 MHz, IPB 66 MHz, PCI 33 MHz 20030.57> Board: MPC5200 ECU 20030.57> I2C: 85 kHz, ready 20030.57> DRAM: 8 MB 20030.57> FLASH:
I'm using eldk 4.0 + insight to debug the problem. I can single-step through the code up to the point where it branches to sdram. After relocation I loaded a new symbol file width offset 0x7d8000, since this is the dest-address for relocate_code().
If I continue running from that point on the board crashes at 0x7dc314 which is in function loadtask(). In assembler the code looks like this: "0x7dc314 <loadtask+48>: lwz r11,-32768(r30)"
Can this be a sdram related problem or what might cause this behavior?
Any comments and suggestions are more than welcome.
Best regards,
André Puschmann
In message ekhurb$vvk$1@sea.gmane.org you wrote:
I have ported u-boot to a custom board based on a freescale mpc5200. I can successfully copy u-boot into flash using the connected bdi2000 and we get some output on the debug port. It seems that the board crashes right after relocation to ram (see output). I already read the regarding faq entry but I'm not sure if this problem has something to do with faulty sdram initialization.
Guess why the FAQ is there?
Can this be a sdram related problem or what might cause this behavior?
Please re-read the FAQ.
Any comments and suggestions are more than welcome.
The FAQ is based on (a) a lot of experience and (b) a lot of questions from engineers who've been there before you. Don't ignore it.
Best regards,
Wolfgang Denk
Wolfgang Denk wrote:
In message ekhurb$vvk$1@sea.gmane.org you wrote:
I have ported u-boot to a custom board based on a freescale mpc5200. I can successfully copy u-boot into flash using the connected bdi2000 and we get some output on the debug port. It seems that the board crashes right after relocation to ram (see output). I already read the regarding faq entry but I'm not sure if this problem has something to do with faulty sdram initialization.
Guess why the FAQ is there?
Can this be a sdram related problem or what might cause this behavior?
Please re-read the FAQ.
Any comments and suggestions are more than welcome.
The FAQ is based on (a) a lot of experience and (b) a lot of questions from engineers who've been there before you. Don't ignore it.
Hello, I really admire the experience of all those engineers and don't wanna spam the list. I read the FAQ many times and double-checked the sdram initialization as well as compared it with other code.
But I still didn't find the problem and I'm still hanging at this point.
Are there any other configuration parts that are necessary to know at this point of u-boot loading?
here is the dram init-code I'm using: <code> #define SDRAM_MODE 0x00CD0000 /* burst_len = 8, cas = 3, wrt_str set */ #define SDRAM_CONTROL 0x504F0000 #define SDRAM_CONFIG1 0x62322900 #define SDRAM_CONFIG2 0x88C70004
/* configure SDRAM start/end */ *(vu_long *)MPC5XXX_SDRAM_CS0CFG = 0x00000016; /* 8MB at 0x00000000 */ *(vu_long *)MPC5XXX_SDRAM_CS1CFG = 0x00000000; /* disabled */
/* setup config registers */ *(vu_long *)MPC5XXX_SDRAM_CONFIG1 = SDRAM_CONFIG1; *(vu_long *)MPC5XXX_SDRAM_CONFIG2 = SDRAM_CONFIG2;
/* unlock mode register */ *(vu_long *)MPC5XXX_SDRAM_CTRL = (SDRAM_CONTROL | MODE_EN);
/* precharge all banks */ *(vu_long *)MPC5XXX_SDRAM_CTRL = (SDRAM_CONTROL | MODE_EN | SOFT_PRE);
/* set mode register */ *(vu_long *)MPC5XXX_SDRAM_MODE = SDRAM_MODE;
/* precharge all banks */ *(vu_long *)MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL | MODE_EN | SOFT_REF;
/* auto refresh */ *(vu_long *)MPC5XXX_SDRAM_CTRL = (SDRAM_CONTROL | MODE_EN | SOFT_REF);
/* set mode register */ *(vu_long *)MPC5XXX_SDRAM_MODE = SDRAM_MODE;
/* normal operation */ *(vu_long *)MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL; </code>
Best regards,
Wolfgang Denk
Thanks for your help.
Andre
Andre Puschmann wrote:
Wolfgang Denk wrote:
In message ekhurb$vvk$1@sea.gmane.org you wrote:
I have ported u-boot to a custom board based on a freescale mpc5200. I can successfully copy u-boot into flash using the connected bdi2000 and we get some output on the debug port. It seems that the board crashes right after relocation to ram (see output). I already read the regarding faq entry but I'm not sure if this problem has something to do with faulty sdram initialization.
Guess why the FAQ is there?
Can this be a sdram related problem or what might cause this behavior?
Please re-read the FAQ.
Any comments and suggestions are more than welcome.
The FAQ is based on (a) a lot of experience and (b) a lot of questions from engineers who've been there before you. Don't ignore it.
Hello, I really admire the experience of all those engineers and don't wanna spam the list. I read the FAQ many times and double-checked the sdram initialization as well as compared it with other code.
But I still didn't find the problem and I'm still hanging at this point.
Are there any other configuration parts that are necessary to know at this point of u-boot loading?
here is the dram init-code I'm using:
<code> #define SDRAM_MODE 0x00CD0000 /* burst_len = 8, cas = 3, wrt_str set */ #define SDRAM_CONTROL 0x504F0000 #define SDRAM_CONFIG1 0x62322900 #define SDRAM_CONFIG2 0x88C70004
/* configure SDRAM start/end */ *(vu_long *)MPC5XXX_SDRAM_CS0CFG = 0x00000016; /* 8MB at 0x00000000 */ *(vu_long *)MPC5XXX_SDRAM_CS1CFG = 0x00000000; /* disabled */
/* setup config registers */ *(vu_long *)MPC5XXX_SDRAM_CONFIG1 = SDRAM_CONFIG1; *(vu_long *)MPC5XXX_SDRAM_CONFIG2 = SDRAM_CONFIG2;
/* unlock mode register */ *(vu_long *)MPC5XXX_SDRAM_CTRL = (SDRAM_CONTROL | MODE_EN);
/* precharge all banks */ *(vu_long *)MPC5XXX_SDRAM_CTRL = (SDRAM_CONTROL | MODE_EN | SOFT_PRE);
/* set mode register */ *(vu_long *)MPC5XXX_SDRAM_MODE = SDRAM_MODE;
/* precharge all banks */ *(vu_long *)MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL | MODE_EN | SOFT_REF;
/* auto refresh */ *(vu_long *)MPC5XXX_SDRAM_CTRL = (SDRAM_CONTROL | MODE_EN | SOFT_REF);
/* set mode register */ *(vu_long *)MPC5XXX_SDRAM_MODE = SDRAM_MODE;
/* normal operation */ *(vu_long *)MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL;
</code>
Best regards,
Wolfgang Denk
Thanks for your help.
Andre
Is the instruction that is crashing correct? When you dump the equivalent location in flash, is that same exact instruction there? If you look at the offending location in SDRAM with your debugger, do you see the same instruction as when it crashes? (Debuggers tend to read memory slowly, so it may read the right value where an instruction fetch may misread the value.)
If it is a SDRAM problem, the answer to the above questions will likely be "no" - this is indicating SDRAM has been corrupted. This could be due to an initialization problem, but could be a flaky board (layout problems). Can you run your board at a slower clock rate?
If the culprit instruction is identical in flash, it is very likely a configuration/code issue, not a SDRAM initialization or board layout issue.
gvb
Jerry Van Baren wrote:
Andre Puschmann wrote:
Wolfgang Denk wrote:
In message ekhurb$vvk$1@sea.gmane.org you wrote:
I have ported u-boot to a custom board based on a freescale mpc5200. I can successfully copy u-boot into flash using the connected bdi2000 and we get some output on the debug port. It seems that the board crashes right after relocation to ram (see output). I already read the regarding faq entry but I'm not sure if this problem has something to do with faulty sdram initialization.
Guess why the FAQ is there?
Can this be a sdram related problem or what might cause this behavior?
Please re-read the FAQ.
Any comments and suggestions are more than welcome.
The FAQ is based on (a) a lot of experience and (b) a lot of questions from engineers who've been there before you. Don't ignore it.
Hello, I really admire the experience of all those engineers and don't wanna spam the list. I read the FAQ many times and double-checked the sdram initialization as well as compared it with other code.
But I still didn't find the problem and I'm still hanging at this point.
Are there any other configuration parts that are necessary to know at this point of u-boot loading?
here is the dram init-code I'm using:
<code> #define SDRAM_MODE 0x00CD0000 /* burst_len = 8, cas = 3, wrt_str set */ #define SDRAM_CONTROL 0x504F0000 #define SDRAM_CONFIG1 0x62322900 #define SDRAM_CONFIG2 0x88C70004
/* configure SDRAM start/end */ *(vu_long *)MPC5XXX_SDRAM_CS0CFG = 0x00000016; /* 8MB at 0x00000000 */ *(vu_long *)MPC5XXX_SDRAM_CS1CFG = 0x00000000; /* disabled */
/* setup config registers */ *(vu_long *)MPC5XXX_SDRAM_CONFIG1 = SDRAM_CONFIG1; *(vu_long *)MPC5XXX_SDRAM_CONFIG2 = SDRAM_CONFIG2;
/* unlock mode register */ *(vu_long *)MPC5XXX_SDRAM_CTRL = (SDRAM_CONTROL | MODE_EN);
/* precharge all banks */ *(vu_long *)MPC5XXX_SDRAM_CTRL = (SDRAM_CONTROL | MODE_EN | SOFT_PRE);
/* set mode register */ *(vu_long *)MPC5XXX_SDRAM_MODE = SDRAM_MODE;
/* precharge all banks */ *(vu_long *)MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL | MODE_EN | SOFT_REF;
/* auto refresh */ *(vu_long *)MPC5XXX_SDRAM_CTRL = (SDRAM_CONTROL | MODE_EN | SOFT_REF);
/* set mode register */ *(vu_long *)MPC5XXX_SDRAM_MODE = SDRAM_MODE;
/* normal operation */ *(vu_long *)MPC5XXX_SDRAM_CTRL = SDRAM_CONTROL;
</code>
Best regards,
Wolfgang Denk
Thanks for your help.
Andre
Is the instruction that is crashing correct? When you dump the equivalent location in flash, is that same exact instruction there? If you look at the offending location in SDRAM with your debugger, do you see the same instruction as when it crashes? (Debuggers tend to read memory slowly, so it may read the right value where an instruction fetch may misread the value.)
Well, I can't check this for now, since I don't have the system here. But I will do this tomorrow. I already checked if the code is the same after relocation to ram but I just compared some few bytes. To debug code after relocation one have to calculate an offset to find the right symbols. Is this address the same that is given to relocate_code() in board_init_f(), since it doesn't follows the equation offered in the regarding faq-entry? I have an 0x8000 additional offset. 0x800000(2MB) - 0x30000(192kb) = 0x7d0000 But 0x7d8000 is given as destination address to relocate_code(). I am asking just to be sure to debug the right way.
If it is a SDRAM problem, the answer to the above questions will likely be "no" - this is indicating SDRAM has been corrupted. This could be due to an initialization problem, but could be a flaky board (layout problems). Can you run your board at a slower clock rate?
If the culprit instruction is identical in flash, it is very likely a configuration/code issue, not a SDRAM initialization or board layout issue.
I will check this tomorrow but I guess the sdram initialization should be ok, since it is working (the same parameters) with another os that also uses caches and dma for a long while.
gvb
Thank you very much.
Andre
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Andre Puschmann wrote:
Hey folkes, I have ported u-boot to a custom board based on a freescale mpc5200. I can successfully copy u-boot into flash using the connected bdi2000 and we get some output on the debug port. It seems that the board crashes right after relocation to ram (see output). I already read the regarding faq entry but I'm not sure if this problem has something to do with faulty sdram initialization.
this is the output than comes up on the console:
20030.56> U-Boot 1.1.6-ge4bbd8da-dirty (Nov 27 2006 - 18:46:24) 20030.56> 20030.56> CPU: MPC5200 v1.2, Core v1.1 at 396 MHz 20030.56> Bus 132 MHz, IPB 66 MHz, PCI 33 MHz 20030.57> Board: MPC5200 ECU 20030.57> I2C: 85 kHz, ready 20030.57> DRAM: 8 MB 20030.57> FLASH:
I'm using eldk 4.0 + insight to debug the problem. I can single-step through the code up to the point where it branches to sdram. After relocation I loaded a new symbol file width offset 0x7d8000, since this is the dest-address for relocate_code().
If I continue running from that point on the board crashes at 0x7dc314 which is in function loadtask(). In assembler the code looks like this: "0x7dc314 <loadtask+48>: lwz r11,-32768(r30)"
Can this be a sdram related problem or what might cause this behavior?
Any comments and suggestions are more than welcome.
Best regards, André Puschmann
If it _isn't_ a SDRAM related problem, I suggest you look into what is going on in loadtask+48 (source and also disassemble it using the cross flavor of objdump). -32768 is integer for "the largest negative number you can represent" and I would be suspicious that it is a reference to a variable that is undefined or too far distant to be reached relative to r30. What is r30 in this context and what is it trying to access?
gvb
Hello everybody, yesterday I solved my problem. It was a faulty sdram initialization. But still don't know why the values I used before didn't work. But its kind of robustness that the systems works with the values assumed not to work. Anyway, thank you for your help.
Best regards,
Andre
Andre Puschmann wrote:
Hey folkes, I have ported u-boot to a custom board based on a freescale mpc5200. I can successfully copy u-boot into flash using the connected bdi2000 and we get some output on the debug port. It seems that the board crashes right after relocation to ram (see output). I already read the regarding faq entry but I'm not sure if this problem has something to do with faulty sdram initialization.
this is the output than comes up on the console:
20030.56> U-Boot 1.1.6-ge4bbd8da-dirty (Nov 27 2006 - 18:46:24) 20030.56> 20030.56> CPU: MPC5200 v1.2, Core v1.1 at 396 MHz 20030.56> Bus 132 MHz, IPB 66 MHz, PCI 33 MHz 20030.57> Board: MPC5200 ECU 20030.57> I2C: 85 kHz, ready 20030.57> DRAM: 8 MB 20030.57> FLASH:
I'm using eldk 4.0 + insight to debug the problem. I can single-step through the code up to the point where it branches to sdram. After relocation I loaded a new symbol file width offset 0x7d8000, since this is the dest-address for relocate_code().
If I continue running from that point on the board crashes at 0x7dc314 which is in function loadtask(). In assembler the code looks like this: "0x7dc314 <loadtask+48>: lwz r11,-32768(r30)"
Can this be a sdram related problem or what might cause this behavior?
Any comments and suggestions are more than welcome.
Best regards,
André Puschmann
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participants (3)
-
Andre Puschmann -
Jerry Van Baren -
Wolfgang Denk