AvaotaA1全志T527开发板AMP异构计算资源划分

DSP 资源

由于DSP的cacheable空间大小只能按照你512MB去划分，而且跳转指令不能超过1G空间，因此对于SRAM、以及DRAM的空间，DSP存在多套地址映射，根据不同的地址段区分cacheable和non-cacheable。

DSP的local sram包括IRAM和DRAM0/1，放在DSP内部，其他主机可以通过DSP的总线接口对该RAM进行访问，而DSP可以通过特定地址（0x0040_0000 - 0x0044_FFFF）对其直接访问，实现最高效率。

RV资源

设备树配置

reserved-memory {
    dsp0ddr_reserved: dsp0ddr@4a000000 {
        reg =<0x00x4a0000000x00x00a00000>;
        no-map;
};

    riscvsram0_reserved: riscvsram0@7280000{
        reg =<0x00x072800000x00x40000>;
        no-map;
};

    riscvsram1_reserved: riscvsram1@72c0000 {
        reg =<0x00x072c00000x00x40000>;
        no-map;
};

/*
    * The name should be "vdev%dbuffer".
    * Its size should be not less than
    *     RPMSG_BUF_SIZE * (num of buffers in a vring) * 2
    *   = 512 * (num of buffers in a vring) * 2
    */
    dsp_vdev0buffer: vdev0buffer@4ac00000 {
        compatible ="shared-dma-pool";
        reg =<0x00x4ac000000x00x40000>;
        no-map;
};

/*
    * The name should be "vdev%dvring%d".
    * The size of each should be not less than
    *     PAGE_ALIGN(vring_size(num, align))
    *   = PAGE_ALIGN(16 * num + 6 + 2 * num + (pads for align) + 6 + 8 * num)
    *
    * (Please refer to the vring layout in include/uapi/linux/virtio_ring.h)
    */
    dsp_vdev0vring0: vdev0vring0@4ac40000 {
        reg =<0x00x4ac400000x00x2000>;
        no-map;
};
    dsp_vdev0vring1: vdev0vring1@4ac42000 {
        reg =<0x00x4ac420000x00x2000>;
        no-map;
};

/*
     * The name should be "vdev%dbuffer".
     * Its size should be not less than
     *     RPMSG_BUF_SIZE * (num of buffers in a vring) * 2
     *   = 512 * (num of buffers in a vring) * 2
     */
    rv_vdev0buffer: vdev0buffer@4ae00000 {
        compatible ="shared-dma-pool";
        reg =<0x00x4ae000000x00x40000>;
        no-map;
};

/*
     * The name should be "vdev%dvring%d".
     * The size of each should be not less than
     *     PAGE_ALIGN(vring_size(num, align))
     *   = PAGE_ALIGN(16 * num + 6 + 2 * num + (pads for align) + 6 + 8 * num)
     *
     * (Please refer to the vring layout in include/uapi/linux/virtio_ring.h)
     */
    rv_vdev0vring0: vdev0vring0@4ae40000 {
        reg =<0x00x4ae400000x00x2000>;
        no-map;
};
    rv_vdev0vring1: vdev0vring1@4ae42000 {
        reg =<0x00x4ae420000x00x2000>;
        no-map;
};

/*
    * mcu ram addr
    */
    mcu0iram_reserved: mcu0iram@20000{
        reg =<0x00x200000x00x10000>;
        no-map;
};
    mcu0dram0_reserved: mcu0dram0@30000{
        reg =<0x00x300000x00x8000>;
        no-map;
};
    mcu0dram1_reserved: mcu0dram1@38000{
        reg =<0x00x380000x00x8000>;
        no-map;
};

    dsp0_rpbuf_reserved: dsp0_rpbuf@4ae44000 {
        compatible ="shared-dma-pool";
        no-map;
        reg =<0x00x4ae440000x00x8000>;
};

    dsp_share_space@4ab00000 {
        no-map;
        reg =<0x00x4ab000000x00x10000>;
};
};