About cache enabling in LWIP port of BBB in RTEMS

[Joel Sherrill]

On September 17, 2015 8:26:41 AM CDT, "Marcos Díaz" <marcos.diaz at tallertechnologies.com> wrote:
>Hi,
>
>How did you see the revision number? if you are using u-boot you can
>pause the start and write printenv and enter to see that:
>
>
>board=am335x
>board_name=A335BNLT 
>board_rev=00C0
>
>
>This is in my version.
>
>Please tell me so I can check if is the revision, or perhaps is
>something else in u-boot initialization.
>
>
>For the question Joel asked there is a way:
>
>http://dumb-looks-free.blogspot.com.ar/2014/05/beaglebone-black-bbb-revision-serial.html
>
>apparently, in the eeprom thorugh i2c it is recorded. But first we must
>confirm that is a problem from the revisions, since Ragu has the
>problem in a rev C.

Does the SoC itself have a revision number we can read? It may be that newer boards have a newer CPU.

>Greetings
>
>
>On Wed, Sep 16, 2015 at 7:22 PM, Joel Sherrill
><joel.sherrill at oarcorp.com> wrote:
>
>
>
>On 9/16/2015 2:41 PM, ragu nath wrote:
>
>Hi Marcos,
>
>Great news! I did not  find any solution to the issue. I have a REV C
>board from element14. Is this the same board you are using?  In my
>board I saw the issue.
>
>Does this have anything to do with the patch you submitted [PATCH]
>Beaglebone: fix missing clobber in inline assembly.
>https://lists.rtems.org/pipermail/devel/2015-September/012531.html
>I have not yet tested with this patch.
>
>The freebsd driver is working with cache disabled.  If possible pls
>check if it is working with cache enabled in your board.
>
>
>If this is a board revision related issue, is there a way
>programmatically to
>know which revision the board is? That way the BSP could auto-detect
>the right
>thing to do. Otherwise, we may be looking at a BSP variant or a build
>option.
>I would rather avoid those if we can auto-detect.
>
>--joel
>
>
>Thanks,
>Ragunath
>
>
>On Mon, Sep 14, 2015 at 7:22 PM, Marcos Díaz
><marcos.diaz at tallertechnologies.com
><mailto:marcos.diaz at tallertechnologies.com>> wrote:
>
>    Hi Ragu,
>I wanted to know if you were able to see something else about the
>problem we had in the BBB when using LWIP and enabling cache ( the
>program freezes).
>I can tell you that here we were using BBB rev. A5C and had this
>problem, but now we could test this with a BBB Rev C, and it
>successfully works with cache enabled (using the same sdcard in both
>boards, one works and the other doesn't).
>    Greetings
>
>    --
>
>    ______________________________
>
>    <http://www.tallertechnologies.com>
>
>    *
>    *
>
>    Marcos Díaz
>
>    Software Engineer
>
>    *
>    *
>
>    San Lorenzo 47, 3rd Floor, Office 5
>
>    Córdoba, Argentina
>
>    *
>    *
>
>    Phone:+54 351 4217888 / +54 351 4218211/ +54 351 7617452
>
>    Skype:markdiaz22
>
>
>
>
>
>--
>ragu
>
>
>-- 
>Joel Sherrill, Ph.D.             Director of Research & Development
>joel.sherrill at OARcorp.com        On-Line Applications Research
>Ask me about RTEMS: a free RTOS  Huntsville AL 35805
>Support Available                (256) 722-9985
>
>
>
>
>-- 
>
>______________________________
>
> 
>
>
>Marcos Díaz
>
>Software Engineer
>
>
>San Lorenzo 47, 3rd Floor, Office 5
>
>Córdoba, Argentina 
>
>
>Phone: +54 351 4217888 / +54 351 4218211/ +54 351 7617452
>
>Skype: markdiaz22

--joel