c908x: Add fastmem setting support #3
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As Guo Ren said from the kernel mailing list [1], future T-Head CPUs, including the newer versions of T-Head C908, will feature standard Sscofpmf extension. For these CPUs, T-Head's implementation of PMU Overflow Interrupts may not needed anymore. In this case, we shouldn't apply T-Head PMU for all T-Head CPUs. Thus, this patch separated T-Head PMU errata. [1] https://lore.kernel.org/linux-riscv/[email protected]/ Signed-off-by: Yangyu Chen <[email protected]> Reviewed-by: Inochi Amaoto <[email protected]> Reviewed-by: Anup Patel <[email protected]>
Xuantie C908X supports fast memory configuration vector and scalar
memory access instructions to access external SRAM.
Configure the starting address and size through CSR_MFASTMBA. For
specific settings, please refer to the datasheet.
Dynamic configuration is achieved by parsing dts through opensbi.
The dts reference configuration is as follows:
```
/ {
compatible = "xuantie,c908x";
model = "xuantie,c908x";
fastmem {
mfastmba = <0x12 0x34567890>;
};
};
```
Signed-off-by: hanyu.cp <[email protected]>
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Xuantie C908X supports fast memory configuration vector and scalar
memory access instructions to access external SRAM.
Configure the starting address and size through CSR_MFASTMBA. For
specific settings, please refer to the datasheet.
Dynamic configuration is achieved by parsing dts through opensbi.
The dts reference configuration is as follows: