DSP 资源
| Module | cacheable属性 | Address | Size | 地址映射说明 |
|---|---|---|---|---|
| DSP IRAM | non-cacheable | 0x0002_0000 - 0x0002_FFFF | 64KB | DSP通过外部总线访问 |
| DSP DRAM0 | non-cacheable | 0x0003_0000 - 0x0003_7FFF | 32KB | DSP通过外部总线访问 |
| DSP DRAM1 | non-cacheable | 0x0003_8000 - 0x0003_FFFF | 32KB | DSP通外部总线访问 |
| DSP IRAM | non-cacheable | 0x0040_0000 - 0x0040_FFFF | 64KB | DSP通过内部总线访问 |
| DSP DRAM0 | non-cacheable | 0x0042_0000 - 0x0042_7FFF | 32KB | DSP通过内部总线访问 |
| DSP DRAM1 | non-cacheable | 0x0044_0000 - 0x0044_7FFF | 32KB | DSP通过内部总线访问 |
| DRAM SPACE | non-cacheable | 0x1000_0000 - 0x1FFF_FFFF | 256M | 对应DDRR的前256M空间(需要DSP输出ahb做地址重映射) |
| DSP IRAM | cacheable | 0x2002_0000 - 0x2002_FFFF | 64KB | DSP通过外部总线访问 |
| DSP DRAM0 | cacheable | 0x2003_0000 - 0x2003_7FFF | 32KB | DSP通过外部总线访问 |
| DSP DRAM1 | cacheable | 0x2003_8000 - 0x2003_FFFF | 32KB | DSP通过外部总线访问 |
| DRAM SPACE | cacheable | 0x3000_0000 - 0x3FFF_FFFF | 256M | 对应DDR的前256M空间(需要DSP输出ahb做地址重映射) |
| DRAM SPACE | non-cacheable | 0x4000_0000 - 0x7FFF_FFFF | 1G | DRAM特殊映射 |
| DRAM SPACE | cacheable可配置 | 0x8000_0000 - 0xBFFF_FFFF | 1G | 预留空间 |
| DRAM SPACE | cacheable | 0xC000_0000 - 0xFFFF_FFFF | 1G | 直接映射到DDR对应空间 |
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
| Module | cacheable属性 | Address | Size | 地址映射说明 |
|---|---|---|---|---|
| DSP IRAM | non-cacheable | 0x0002_0000 - 0x0002_FFFF | 64KB | |
| DSP DRAM0 | non-cacheable | 0x0003_0000 - 0x0003_7FFF | 32KB | |
| DSP DRAM1 | non-cacheable | 0x0003_8000 - 0x0003_FFFF | 32KB | |
| SRAM A2 | non-cacheable | 0x0004_0000 - 0x0006_3FFF | 16+128KB | 系统外设 |
| 其他 | non-cacheable | 0x0800_0000 - 0x3FEF_FFFF | 与CPUX memory mapping一致 | |
| SRAM SPACE0 | 0x3FF0_0000 - 0x3FFF_FFFF | 1MB(实际使用256KB) | 0x3FF0_0000 - 0x3FFB_FFFF在总线上被屏蔽，0x3FFC_0000 - 0x3FFF_FFFF映射到DSP SRAM0 0x0728_0000 - 0x072B_FFFF | |
| SRAM SPACE1 | 0x4000_0000 - 0x7FFF_FFFF | 1GB | 0x4000_0000 - 0x4003_FFFF映射到DSP SRAM1 0x072C_0000 - 0x072F_FFFF,其余区间无映射 |
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>;
};
};
