About cache enabling in LWIP port of BBB in RTEMS
Joel Sherrill
joel.sherrill at oarcorp.com
Thu Sep 17 20:02:25 UTC 2015
Can of of you guys start a table/spreadsheet about board
and SoC revisions and when we think it is broken and when
it works?
I emailed the BB project lead and he didn't know anything
off hand but suggested subscribing to beagleboard at googlegroups.com
and asking there. Someone there may actually have an answer.
--joel
On 9/17/2015 2:05 PM, Marcos Díaz wrote:
> Ragu,
> I would like you to confirm which revision you have, for this I printed the following registers in the BBB:
>
> 0x44E10600 and 0x44E10604
>
> The first will print something like:
> 1b94402e for BBB rev A5C (XAM3359AZCZ100) ( 1b means rev.A of the microcontroller)
> 2b94402e for BBB rev C (AM3358BZCZ100) (2b means rev B of the microcontroller)
>
> The second register will print something like:
>
> 20ff0383 for A5c (this means that this is AM3359)
> 20fd0383 for C (this means it is an AM3358).
>
> Please let me know which are this values in your Board.
>
> Thanks!
>
>
>
> On Thu, Sep 17, 2015 at 11:44 AM, Marcos Díaz <marcos.diaz at tallertechnologies.com <mailto:marcos.diaz at tallertechnologies.com>> wrote:
>
> Yes, sorry about that, There are two registers we can check to see the different revision numbers. I will check it myself once i confirm that the different revisions are the problem (i'm not sure because of what Ragu said). Thanks!
>
> On Thu, Sep 17, 2015 at 11:12 AM, Joel Sherrill <joel.sherrill at oarcorp.com <mailto:joel.sherrill at oarcorp.com>> wrote:
>
>
>
> On 9/17/2015 8:43 AM, Marcos Díaz wrote:
>
> Yes, in my case the older (that doesn't work) revision is a
> XAM3359AZCZ100
>
> And the rev C (that works well with cache) is
> AM3358BZCZ100
>
>
> Can we determine that in software?
>
> On Thu, Sep 17, 2015 at 10:32 AM, Joel Sherrill <joel.sherrill at oarcorp.com <mailto:joel.sherrill at oarcorp.com> <mailto:joel.sherrill at oarcorp.com <mailto:joel.sherrill at oarcorp.com>>> wrote:
>
>
>
> On September 17, 2015 8:26:41 AM CDT, "Marcos Díaz" <marcos.diaz at tallertechnologies.com <mailto:marcos.diaz at tallertechnologies.com> <mailto:marcos.diaz at tallertechnologies.com <mailto: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 <mailto:joel.sherrill at oarcorp.com> <mailto:joel.sherrill at oarcorp.com <mailto: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> <mailto:marcos.diaz at tallertechnologies.com <mailto:marcos.diaz at tallertechnologies.com>>
> ><mailto:marcos.diaz at tallertechnologies.com <mailto:marcos.diaz at tallertechnologies.com> <mailto: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
>
>
>
>
> --
>
> ______________________________
>
> <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
>
>
>
> --
> 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
>
>
>
>
> --
>
> ______________________________
>
> <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
>
>
>
>
>
> --
>
> ______________________________
>
> <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
>
>
--
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
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