Hi,
After some tweaks:
- barebox is able to display prompt
- MMC is correctly configured
- Linux is correctly configured/enables to boot with console feedback.
I have sent a patch serie to fix these issues.
Thanks to all
Gwenhael
Le 05/07/2025 à 5:21 PM, Michael Graichen a écrit :
Am 5. Juli 2025 09:01:38 MESZ schrieb Gwenhael Goavec-Merou
<gw...@trabucayre.com>:
Hi,
Thanks for informations: after deleting everything but the last two lines,
barebox starts has expected.
Now I have and error with SDCard but maybe related to lines removes or
something similar.
Hey,
please show me the error messages once you put #define DEBUG at the top of
mci-core.c
I'm also using a patches Version of drivers/mci/mci-core.c
First thing is that the amplitude of SD-Cards clock signal decreases with
higher speed on Zynq-7000. I had to reduce SD-Cards speed to 25MHz within
lowlevel.c. Next thing is mci-core.c does some speed and line testing that then
causes error messages for my eMMC on the other line. So I skip this tests.
Since the board i'm working on doesn't change anymore, that's fine to me. But
probably will not be good for other boards using mci-core.c
A feature to define fixed line nummers and speed mode from devicetree would be
nice here?!
Have and nice weekend,
Michael
Thanks!
Gwenhael
Le 04/07/2025 à 7:38 PM, Johannes Roith a écrit :
Hi Gwenhael, hi Ahmad
Am Fri, Jul 04, 2025 at 04:56:01PM +0200 schrieb Ahmad Fatoum:
Hi Gwenhael,
On 7/3/25 09:18, Gwenhael Goavec-Merou wrote:
Dear all,
I'm trying to uses my zedboard with barebox but can't be able to boot this.
According to mails found in this mailing list I have done this sequence:
export ARCH=arm
export CROSS_COMPILE=$SOMEWHERE/arm-buildroot-linux-gnueabihf-
make zynq_defconfig
make -j$(nproc)
That looks correct IMO.
And copied in the first SDCard FAT partition:
- images/barebox-avnet-zedboard.img as BOOT.bin
- barebox.bin
Which binary is barebox.bin?
The first one is the correct one. Just copy the
images/barebox-avnet-zedboard.img
with the name BOOT.bin to an SD-Card whose first partition is FAT32.
But I have nothing displayed through serial port.
Two things come to mind:
- The Image is 184K. Does the Zynq enforce a maximum limit on the BOOT.BIN?
Yes, there is a limitation for the size of the First Stage Bootloader
(FSBL) as Xilinx calls it, which is the available SRAM size in the ZYNQ
7000 (192 kBytes). Currently Barebox PBL and Barebox Proper are combined
to one image (images/barebox-avnet-zedboard.img) but you will get an
error in the build process, if your image exceeds this size.
- Does DEBUG_LL produce any output? For details on how to configure
DEBUG_LL, see the troubleshooting guide I just Cc'd you on.
Are there somewhere details on how to prepare SD Card for a zynq board?
I haven't done work with the Zynq 7000 so far, but Lucas and Johannes
did. I Cc'd them as they may be able to give some tips for troubleshooting.
I would also take a look at this message on the mailing list:
https://lore.barebox.org/barebox/db7pr02mb43323cd77e0507e560475bcaab...@db7pr02mb4332.eurprd02.prod.outlook.com/
Here, the content of the file
arch/arm/boards/avnet-zedboard/zedboard.zynqcfg caused a boot error for
barebox. With my Digilent Cora Z7 board, I also had to modify the file
by deleting everything but the last line, to get barebox booting. Have
you already tried this?
Cheers,
Ahmad
Thanks
Gwenhael
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Best regards,
Johannes
