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关于DSP6437的PCI配置空间

james new
Prodigy 10 points


我们的产品，在一台X86架构的服务器上，使用了数十个6437DSP,DSP通过PCI接入X86，现在发现由于6437DSP设置的6个PCI内存空间太大（将近40M），档映射到系统地址空间后占用系统大量地址空间，当插入十几个设备后驱动就无法加载驱动。

我想问是否有办法修改PCI配置空间的6个base bar的大小？因为40M的话的确太大了

  • 0
    TI__Guru**** 155073 points

    请问你使用的是PCI启动么?如果是，而且这个大小是ROM code写死的，就没有办法修改了。

  • 0
    TI__Guru 64206 points

    请参考DM6437 PCI User guide 3.2节和3.3节，Window size是可以配置的，如果不需要那么大，可以配小.

    A slave window maps a region in the DSP memory space to a region in the PCI address space. This

    allows a PCI host to access the DSP memory through the PCI address space. A slave window is

    configured with the following registers:

    · PCI slave base address translation register: Configures the starting address of the window in the DSP

    address space.

    · PCI base address register: Configures the starting address of the slave window in the PCI address

    space.

    · PCI base address mask register: Configures the size of the window and prefetchability of the DSP

    memory region being mapped.