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

[Jagan Teki]

On Mon, Jun 30, 2014 at 4:18 PM, Heshsham Abdul Basit
<hf.basit at gmail.com> wrote:
> 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?

Do you have any issue with the second print, it's probing once aging
before reading?

>
> 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.
>
>



-- 
Jagan.