January 2004 - U-Boot

[U-Boot-Users] flash.c
by Ed Okerson 20 Jan '04

20 Jan '04

I would like to implement the functionality found in flash.c for many boards for my board. There seems to be a lot of overlap between them. Is there one that is better than others to start with as a base? My board has a single Intel TE28F128 flash chip, is based on the AMD AU1500, and is currently booting u-boot. I started by trying to modify the flash.c from the a3000 board, but now after u-boot loads any command at the prompt results in u-boot hanging. If I revert to the orginal flash.c I was using from the dbau1x00 boards, commands work properly, but I lack the flash commands. Ed Okerson

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[U-Boot-Users] Support for Alchemy 1500
by Jerry Walden 20 Jan '04

20 Jan '04

Hello - is there any support for the AMD AU1500 (Alchemy) Thanks

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[U-Boot-Users] u-boot patch for coldfire 5272
by Josef Baumgartner 19 Jan '04

19 Jan '04

Hi Wolfgang, I get many requests regarding my coldfire 5272 port. How is the state of my patch? Do you think it could be applied in the next time? Regards, Josef

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[U-Boot-Users] HID0 Register problem
by sudhakar rajashekhara 19 Jan '04

19 Jan '04

Hi All, During porting of U-boot on mpc8280 (U-boot port of MPC8260ads as base) I am facing following problems. I was able to burn the u-boot onto the flash. The first part of intialization was fine ie board_init_f () including the SDRAM (256 MB) initialization. The second part of initialization goes fine and we were able to get the U-boot prompt, provided we comment the portion which initializes the Hardware Implementation-dependent Registers (HID0). But when we enable this portion of code, U-boot hangs once it relocates itself to the RAM. In this condition, though U-boot configures HID0 register, still the value is ZERO. IS this because of improper SDRAM initialization? How do I verify the burst mode operation of SDRAM? Is there any debug routine similar to mtest available for the same? I also want to know whether anyone has flash driver for AMD29F160B CFI compliant flash? regards, Sudhakar. __________________________________ Do you Yahoo!? Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes http://hotjobs.sweepstakes.yahoo.com/signingbonus

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[U-Boot-Users] Re: Questions about startup code for S3C44B0 CPU-core
by Andrea Scian 19 Jan '04

19 Jan '04

Hi Alex, >Hi Andrea, > >in s3c44b0x's app03-test.pdf, the stacks in boot code are initialized like >this: > > ;**************************************************** > ;* Initialize stacks * > ;**************************************************** > ldr sp, =SVCStack ;Why? > bl InitStacks > ...... > ;**************************************************** > ;* Initialize stacks * > ;**************************************************** >InitStacks > ;Don't use DRAM,such as stmfd,ldmfd...... > ;SVCstack is initialized before > ;Under toolkit ver 2.50, 'msr cpsr,r1' can be used instead of > 'msr cpsr_cxsf,r1' > mrs r0,cpsr > bic r0,r0,#MODEMASK > orr r1,r0,#UNDEFMODE|NOINT > msr cpsr_cxsf,r1 ;UndefMode > ldr sp,=UndefStack > > orr r1,r0,#ABORTMODE|NOINT > msr cpsr_cxsf,r1 ;AbortMode > ldr sp,=AbortStack > > orr r1,r0,#IRQMODE|NOINT > msr cpsr_cxsf,r1 ;IRQMode > ldr sp,=IRQStack > > orr r1,r0,#FIQMODE|NOINT > msr cpsr_cxsf,r1 ;FIQMode > ldr sp,=FIQStack > > orr r1,r0,#SVCMODE|NOINT > msr cpsr_cxsf,r1 ;SVCMode > ldr sp,=SVCStack >...... Thanks you very much for the piece of code, I have find the original Samsung document and now I can understand what you are talking about! (well.. it has been a long time since I have read that doc! :-) >But in U-boot there isn't any code like this. In u-boot there is no need of that code because the only thing u-boot does when there is an exception is to reset the board (ARM architecture does not need stack because it uses banked register on exception, so only user code needs it? am I wrong?). BTW I think the reset code is not right because it just jump to the reset vector, which may not be what you want to reset the board (I think the better way is to call cpu_reset() or something like that and use the watchdog, don't you think so?) >BTW, we have run a uclinux in our 44b0x system, but there isn't any code >for initializing stacks in uclinux. >What should the cpu do if any of the exceptions happen? > >So I think the code like this are not very reliable. Is my comprehension >right? Or if we should initialize these stacks before call start_kernel() >in uclinux? Don't really know how the ARM Linux kernel works regarding interrupt and exception stack... are you really sure that it does not initialize stack? Now I don't allocate stack for interrupt but interrupts works pretty well :-) Anyway I'll have a close look at the source code as soon as I can... BTW did you found some ARMLinux docs where it says that ARMLinux bootloader have to set up stack before calling the kernel? (I'll have another look at them too as soon as I can...) Best Regards, Andrea >Best Regards, > >Alex Zu >----- Original Message ----- >From: "Andrea Scian" <andrea.scian(a)dave-tech.it> >To: "Alex Zu" <Seu_huizu(a)tom.com> >Cc: <u-boot-users(a)lists.sourceforge.net> >Sent: Friday, January 14, 2005 7:13 PM >Subject: Re: Questions about startup code for S3C44B0 CPU-core > > > > > > Hi Alex, > > > > > >>Hi Andrea, > >> thank you for your explanation but the stacks of EXCEPTION MODEs > >> which we discussed about > >>is still not very clear. U-boot here does not use interrupts,so there is > >>no need for such > >>initialization for interrupts,but we can"t insure that there is no core > >>exception.In case of > >>these exception,the system may go wrong. So I think that we should > >>initialize the stacks for > >>those exceptions. > > > > BTW, even if not used into the bootloader, interrupt vector are > initialized > > by u-boot (take a look at cpu/s3c44b0/start.S) > > > > > >>And there is no initialization in linux, either.What should linux do in > >>case of these > >>exceptions. So there is the initialization in other common start codes of > >>s3c44b0x. > > > > Something is still not clear to me... could you please tell me where I can > > find some example of such code (or where this initialization is explained > > into the ARM or Samsung manual)? Thanks. > > > > Best Regards, > > > > Andrea Scian > > > >

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[U-Boot-Users] Board hangs during relocate_code..
by sudhakar rajashekhara 18 Jan '04

18 Jan '04

Hi All, During porting of U-boot on mpc8280 (U-boot port of MPC8260ads as base) I am facing following problems. I was able to burn the u-boot onto the flash. The first part of intialization was fine ie board_init_f () including the SDRAM (256 MB) initialization. The board gets hung during the second part of initialization. But the same piece of code works fine when I run from RAM using the JTAG. Is there any specific way to solve this problem? I have configured the FLASH_BASE as 0xFE000000; Flash Chip is 2MB On Board Flash; TEXT_BASE is FFF00000; IMMR is F0000000. Do I miss any specific things in my configuration? One more thing is, the board I am using has two flashes. The 2MB On Board Flash: "AMD 29F160xB (2048 x 8) 1 Device" AND The 64MB SIMM Flash: "INTEL 28F128Jx (16384 x 8) 4 Devices" I checked almost all the flash driver modules that is there with U-boot version of 1.0.0, but I was not able to get the driver for these flashes. Where can I get the same? regards, Sudhakar. __________________________________ Do you Yahoo!? Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes http://hotjobs.sweepstakes.yahoo.com/signingbonus

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[U-Boot-Users] AMD Flash not responding to Autoselect
by sudhakar rajashekhara 16 Jan '04

16 Jan '04

Hi All, I am using AMD 29F160 2MB on board flash on a custom board. I am using the sbc8260/flash.c as the driver file. During flash initialization, the flash is not responding to the following Autoselect command sequences. /* Reset and Write auto select command: read Manufacturer ID */ addr[0] = 0xf0f0f0f0; addr[0x0555] = 0xAAAAAAAA; addr[0x02AA] = 0x55555555; addr[0x0555] = 0x90909090; udelay (1000); vendor = addr[0]; printf("vendor = %08lx\n", vendor); After running these set of statements, if I display vendor ID, I am getting the HRCW configured at the base address of the flash. I am using 0xFE000000 as the flash base. Any solutions? thanks in advance, regards, Sudhakar. __________________________________ Do you Yahoo!? Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes http://hotjobs.sweepstakes.yahoo.com/signingbonus

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[U-Boot-Users] About IQ80321 support boot
by kelphon.Tang (唐天兵) 16 Jan '04

16 Jan '04

Dear all i am a new fun with arm linux. we are looking for a bootloader support Intel iop80321 cpu to load linux kernel. Does the u-boot can't support this CPU? i have read U-Boot's README. but no matter what config should be? Thanks a lot! Happy Work, Happy Life ;) ------------------------------------------- Kelphon Tang SW2, DSBU MiTAC Research(shanghai) LTD. Tel: 86-21-62479332 ext:2238 Fax: 86-21-62479474

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RE: [U-Boot-Users] PCI Enumeration
by Rune Torgersen 15 Jan '04

15 Jan '04

Start by getting the PCI spec.... PCI22.pdf is usually easy to find on the net the 2.3 spec you will have to pay for. Apart from that. Make sure that the IDSEL lines on the PCI connector is driven by DIFFERENT address lines. It sounds like your two slots use the same adress lines for IDSEL. > I'm having an issue with U-Boot failing to recognize PCI devices on bootup. I have a CompactPCI chassis > with a PowerPC 405GP card and a Valleytech PCI carrier board with a TI 6415 DSP on it. The Valleytech > board has an Intel non-transparent PCI bridge chip on it. I also have a PCI carrier board with two custom > mezzanine boards that have TI 6415 DSPs on them. We access the DSP PCI interfaces directly on these > boards. My problem is that the PCI bus fails to find one of the boards when both are plugged in at the > same time. If I only use the Valleytech board, I can talk to it fine; conversely, if I only use our > custom, board, it works. When both are plugged in, U-Boot only lists the card device ID for the card > furthest from the PPC. The PCI initialization also fails when I boot the Debian kernel in this case. I > need to be able to access both cards at the same time so I need to resolve this.

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RE: [U-Boot-Users] Walnut405 PPC hang prob at linux startup
by Rune Torgersen 15 Jan '04

15 Jan '04

Make sure it is not present when you do a printenv in u-boot. > Thank for a quick reply. > > I forgot to mention that tries both ways, i.e. I also > undefined the variable and yet it fails. Any other suggestion ? > > Thanks

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