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whether Linux uses 128 L3 shared RAM

Kalaiyarasan ES
Intellectual 680 points
Other Parts Discussed in Thread: OMAPL138, DA8XX

Hi,

      I am using OMAPL138. I am using evm zoom board.  I have ported Linux in it. I was working fine.  I am using DSPLink which is working fine. 

My application I want to use 128KB shared L3 RAM from DSP. Can I use it?

I want to know,    whether Linux uses this 128 L3 shared RAM ?

Is there any document for Memory used by Linux  for this OMAPL138 platform ?

Thanks & Regards,

Kalaiyarasan ES

  • 0
    TI__Genius 12025 points

    Kalaiyarasan,

    You can look in /proc/iomem to see what memory Linux is using. By default, it should not be using the DSP L3 RAM.

    ~Ramsey

  • 0 in reply to Ramsey
    Intellectual 680 points

    Ramsey,

            When i look /proc/iomem  i found L3 Shared RAM is used by PRUSS.0.   It look like i am not able to use L3 RAM from DSP.

    If i want to use L3 RAM from DSP,  What changes i have to do ?

      I have given my /proc/iomem below:

    root@am180x-evm:~# cat /proc/iomem
    00000000-0003ffff : pruss.0
    01c00000-01c07fff : edma_cc0
      01c00000-01c07fff : edma
    01c08000-01c083ff : edma_tc0
    01c08400-01c087ff : edma_tc1
    01c21000-01c21fff : watchdog
    01c23000-01c23fff : omap_rtc
      01c23000-01c23fff : omap_rtc
    01c30000-01c3ffff : pruss.0
    01c40000-01c40fff : davinci_mmc.0
      01c40000-01c40fff : mmc0
    01c42000-01c4201f : serial
    01d0c000-01d0c01f : serial
    01d0d000-01d0d01f : serial
    01e00000-01e0ffff : mc
      01e00000-01e0ffff : mc
    01e13000-01e13fff : da8xx_lcdc.0
    01e18000-01e19fff : ahci
    01e20000-01e23fff : davinci_emac.1
      01e20000-01e23fff : eth0
    01e24000-01e24fff : davinci_mdio.0
      01e24000-01e24fff : davinci_mdio.0
    01e25000-01e25fff : ohci.0
      01e25000-01e25fff : ohci_hcd
    01e30000-01e37fff : edma_cc1
      01e30000-01e37fff : edma
    01e38000-01e383ff : edma_tc2
    01f0e000-01f0efff : spi_davinci.1
      01f0e000-01f0efff : spi_davinci
    62000000-620807ff : davinci_nand.1
    68000000-68007fff : davinci_nand.1
    80000000-8001ffff : pruss.0
    b0000000-b0007fff : cpuidle-davinci.0
    c0000000-c5ffffff : System RAM
      c002a000-c0413fff : Kernel text
      c0414000-c044bdd7 : Kernel data