[U-Boot] Why spi flash probe runs twice on Xilinx Zynq board ?

[Heshsham Abdul Basit]

Thanks for your comments Thomas and  Jagan!


On 30 June 2014 15:58, Jagan Teki <jagannadh.teki at gmail.com> wrote:

> I guess - your using Xilinx github u-boot-xlnx
>
>
Yes


> The reason for two prints is like, for
> 1) Initial probe print, by default done in env calls
> 2) Added in sf probe again on auto-boot commands [1]
>
> [1]
> https://github.com/Xilinx/u-boot-xlnx/blob/master/include/configs/zynq-common.h
>
>
Ok. I will study it.


BTW is it technically possible to completely get rid of the second probing
which I boot from flash?

Thanks


> On Sat, Jun 28, 2014 at 10:51 PM, Heshsham Abdul Basit
> <hf.basit at gmail.com> wrote:
> >  Hi,
> >
> > I am re-sending this email because earlier I forgot to put the subject
> line
> > properly. I am struggling to figure out few things in u-boot , but I
> failed
> > to get a good resource or help.
> >
> > This is a section of the log from u-boot running on Avnet Microzed board:
> >
> >
> > [Thu Jun 26 17:40:53.656 2014]
> >
> > [Thu Jun 26 17:40:53.656 2014]
> >
> > [Thu Jun 26 17:40:53.656 2014] U-Boot 2013.07 (Jun 26 2014 - 17:34:41)
> >
> > [Thu Jun 26 17:40:53.656 2014]
> >
> > [Thu Jun 26 17:40:53.656 2014] 1 GiB
> >
> > [Thu Jun 26 17:40:53.671 2014] SF: Detected
> > S25FL129P_64K/S25FL128S_64K with page size 64 KiB, total 16 MiB
> >
> > [Thu Jun 26 17:40:53.703 2014] *** Warning - bad CRC, using default
> > environment
> >
> > [Thu Jun 26 17:40:53.703 2014]
> >
> > [Thu Jun 26 17:40:53.703 2014] In:    serial
> >
> > [Thu Jun 26 17:40:53.703 2014] Out:   serial
> >
> > [Thu Jun 26 17:40:53.703 2014] Err:   serial
> >
> > [Thu Jun 26 17:40:53.703 2014] U-BOOT for suheb_24
> >
> > [Thu Jun 26 17:40:53.703 2014]
> >
> > [Thu Jun 26 17:40:53.703 2014]
> >
> > [Thu Jun 26 17:40:53.703 2014] SF: Detected
> > S25FL129P_64K/S25FL128S_64K with page size 64 KiB, total 16 MiB
> >
> > [Thu Jun 26 17:40:54.453 2014] SF: 5242880 bytes @ 0x520000 Read: OK
> >
> > [Thu Jun 26 17:40:54.453 2014]      Description:  PetaLinux Kernel
> >
> > [Thu Jun 26 17:40:54.453 2014] 0x010000f0
> >
> > [Thu Jun 26 17:40:54.453 2014] 4620145 Bytes = 4.4 MiB
> >
> > [Thu Jun 26 17:40:54.453 2014]      Description:  Flattened Device Tree
> blob
> >
> > [Thu Jun 26 17:40:54.453 2014] 0x01468114
> >
> > [Thu Jun 26 17:40:54.453 2014] 9766 Bytes = 9.5 KiB
> >
> > [Thu Jun 26 17:40:54.453 2014]      Hash algo:    crc32
> >
> > [Thu Jun 26 17:40:54.453 2014]      Hash value:   9a94aca8
> >
> > [Thu Jun 26 17:40:54.453 2014]      Hash algo:    sha1
> >
> > [Thu Jun 26 17:40:54.453 2014]      Hash value:
> > 97b81e3014decb706ff19e61e1227dace97d4232
> >
> > [Thu Jun 26 17:40:54.453 2014] crc32+ sha1+  Uncompressing Kernel Image
> ...
> > OK
> >
> > .
> > .I noticed that the following lines are coming twice:
> >
> > SF: Detected S25FL129P_64K/S25FL128S_64K with page size 64 KiB, total 16
> MiB
> >
> > This corresponds to the function spi_flash_probe from
> > drivers/mtd/spi/spi_flash.c
> >
> >
> > I need to know:
> >
> > 1- Why it is probed twice?
> > 2- The name and location of the file from where it is called (twice).
> > 3- The second time it is being probed  is considerably slow, why it is
> so?
> >
> >
> > I have searched many forums and have looked in the code but still I am
> not
> > able to figure out these things.
> >
> >
> >
> > Thanks and regards,
> >
> > Abdul Basit
> >
> > _______________________________________________
> > U-Boot mailing list
> > U-Boot at lists.denx.de
> > http://lists.denx.de/mailman/listinfo/u-boot
> >
>
> thanks!
> --
> Jagan.
>