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

[Jagan Teki]

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

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

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
>
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>

thanks!
-- 
Jagan.