September 2007 - U-Boot

[U-Boot-Users] Your prayers have been answered
by haroldthecableguy＠berkleypm.ca 22 Sep '07

22 Sep '07

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[U-Boot-Users] non-GPL standalone apps
by Matthias Fuchs 22 Sep '07

22 Sep '07

Hi, we are thinking of a standalone application instead of a full blown OS on a U-Boot enabled board. The most simple way to get some simple API (e.g. printf(), getc(), ...) would be to use U-Boot's jump table interface as it is used by the apps in the example subdirectory. Our standalone application cannot use the GPL. Can we do this? Are non-GPL applications that use U-Boot's jumptable interface compatible with the U-Boot licence? Regards Matthias

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[U-Boot-Users] You are on my friends list, join me at Flixya!
by Flixya Invitation 21 Sep '07

21 Sep '07

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[U-Boot-Users] U-Boot problems with MPC8272ADS
by Manil Gaouar 21 Sep '07

21 Sep '07

Finally it worked! My serial cable was crossed!!!! Go figure why! With a direct flat serial everything worked fine...thx for the help... Manil Gaouar wrote: > When I halt the CPU in the infinite loop I can see that my PC is at > 0x03fe88b0, if I subtract 0x3fc5000 = 0x000238b4 in flash = > 0xfff238b4...according to u-boot.map this is the function serial_getc() > which seems that u-boot is running and waiting for an input, and I still > don't have any display on my console. > > I have tried both serial ports with no results. I changed the baud rate > also. > > Scott: How can you write something in the serial port with the BDI it > looks like you have to set many registers before sending one byte > through the serial cable? > > I will investigate more and let you know, I am glad that u-boot is > running! > > Jerry suggested you look at the TD/RD signals on an oscilloscope. Have you done this yet? Much of my life has been wasted tracing this type of stuff to incorrect terminal settings, missing null modem adaptor etc., and the o-scope can be very revealing. I don't think I'm alone here... regards, Ben

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[U-Boot-Users] Dynamic U-Boot configuration via FDT
by Wolfgang Grandegger 21 Sep '07

21 Sep '07

Hello, it want to report on my experience with using FDT to configure U-Boot dynamically for a custom board based on the MPC823. The customer wanted _one_ U-Boot and Linux image for various variants of that board mainly to simplify software maintenance. The following devices required configuration via FDT blob: - LCD panel (type, orientation, color, etc.) - RTC - PCMCIA/IDE - DTT - CAN controller - Some custom devices For most devices it was sufficient to check their presence. Only the LCD panel and the CAN controller required a more sophisticated FDT-based initialization. The FDT was used in a minimalistic and way. This project still uses the good old Linux 2.4.25 from DENX and therefore it's not a good food for discussion. I have attached a patch implementing the essential parts to configure IDE of my Icecube MPC5200 eval board: - The macro definition CFG_FDT_ADDR points to the FDT blob in the Flash. Note that it can also be used before relocation. - After relocation and availability of the U-Boot environment, the function fdt_relocate() copies the blob to a bootable address in RAM defined by the environment variable "fdt_boot_addr". bootm is aware of that address and will use it to boot Linux 2.6 (without third bootm argument). Moving to RAM that early has the advantage of faster access to the FDT and it could be updated by board specific code. - fdt_relocate() calls the board specific function fdt_fixup_board() if the corresponding macro is defined. It might make sense to use the already existing ft_board_setup() for that purpose. - The function cmd_disable() is used to disable U-boot commands for unavailable devices. Note that it cannot be used before relocation. - A lot of dynamic configuration using fdt_find_compatible_node() or fdt_find_node_by_type() could be done in board specific code. Common code like U-Boot commands or device drivers must use the FDT directly. Unfortunately, it requires adding FDT code in many places. For the next generation of U-Boot, FDT probing should therefore be done by a clever device interface. The patch demonstrates how to configure IDE by looking for the "ata" node in the FDT. Limitation, improvements, ideas and further comments: - The LIBFDT can only be used for addresses accessible via pointer. Therefore it cannot be used as-is before relocation and for this reason I have just defined and implemented CFG_FDT_ADDR (FDT in EEPROM or NAND is not supported). - Many drivers do not yet support multiple configurations like DTT, RTC, LCD, etc. - A suitable default address for FDT blob relocation could be used instead of an address defined by the U-Boot environment variable "fdt_boot_addr", (or both). - fdt_relocate() could also heck for a FDT U-Boot image at the address (CFG_FDT_ADDR - 64) and act accordingly. - The U-Boot command "fdt" works right away. - We might want to support multiple FDT blobs, which could be selected through an U-Boot environment variable. But such blobs could not be used in the early boot phase. In May there was already some basic discussion on this topic: See http://sourceforge.net/mailarchive/forum.php?thread_name=464D6D4A.4000200%4… The central question is to what extend we want to use the FDT to configure U-Boot. I already regard the extensive use of the FDT in Linux 2.6 as kind of overkill. Please comment. Thanks. Wolfgang.

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[U-Boot-Users] (no subject)
by 杨进忠 21 Sep '07

21 Sep '07

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[U-Boot-Users] (no subject)
by 杨进忠 21 Sep '07

21 Sep '07

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[U-Boot-Users] Ethernet port
by Yasothabalan Ramaswamy-TLS,Chennai 21 Sep '07

21 Sep '07

Hi all, Can anyone say me whether U-Boot supports two Ethernet ports? If so, how to set the IP and MAC address for the second one. Regards, Yasotha Balan R DISCLAIMER: ----------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. It shall not attach any liability on the originator or HCL or its affiliates. Any views or opinions presented in this email are solely those of the author and may not necessarily reflect the opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of the author of this e-mail is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any mail and attachments please check them for viruses and defect. -----------------------------------------------------------------------------------------------------------------------

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Re: [U-Boot-Users] U-Boot problems with MPC8272ADS
by Manil Gaouar 21 Sep '07

21 Sep '07

When I halt the CPU in the infinite loop I can see that my PC is at 0x03fe88b0, if I subtract 0x3fc5000 = 0x000238b4 in flash = 0xfff238b4...according to u-boot.map this is the function serial_getc() which seems that u-boot is running and waiting for an input, and I still don't have any display on my console. I have tried both serial ports with no results. I changed the baud rate also. Scott: How can you write something in the serial port with the BDI it looks like you have to set many registers before sending one byte through the serial cable? I will investigate more and let you know, I am glad that u-boot is running! Scott Wood wrote: > Manil Gaouar wrote: >> I installed u-boot on my mpc8272ads board, and when I connect the >> board with a serial link to my pc, I don't see any output in the >> console, I use cu S0@115200, I have connected a JTAG to see what's >> happening in the board I can see that the PC register is changing and >> going through the memory, and the pc will be stuck in an infinite >> loop which means that he is waiting for an input, > > That's hardly the only case in which code can get stuck in an infinite loop. When you halt the CPU with the JTAG, what the PC value? Look it up in your u-boot link map, where is it looping? >> probable the command prompt. I have compared different positions in >> my PC register and the u-boot.map and I can see which function my >> code is at, so u-boot is running, but why I don't have a display?? > > Did you check that the serial port is properly initialized, including > I/O pin and BRG setup? Can you get serial output by manually poking the > registers with the BDI? > > -Scott The second dumbest question: did you plug your serial cable into _both_ of the mpc8272ads board's serial ports? The third dumbest question: did you try different baud rates on your PC (or, better, look at the board's serial output with an o'scope)? gvb P.S. The first dumbest question is "Is it plugged in?"

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[U-Boot-Users] Uboot mkimg question
by Shiju 20 Sep '07

20 Sep '07

Hello, I am converting a linux zImage for my arm platform to uImage so that uboot can load the kernel. So my question is does the mkimage parameters, the "load address" and the "entry point" depends on the zImage I created. Or could I set these values to any valid RAM address. Thanks, Shiju

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