Re: 回复: 回复: 回复: [PATCH] firmware: scmi: Drop mmu_set_region_dcache_behaviour() misuse

[Marek Vasut]

On 10/31/25 4:36 AM, Alice Guo (OSS) wrote:

Hello Alice,

Would it be possible to fix up the SRAM mapping in:

arch/arm/mach-imx/imx8ulp/soc.c:static struct mm_region
imx8ulp_arm64_mem_map[] = {

?

--
Best regards,
Marek Vasut

Hi Marek,

Configuring the memory region for SCMI communication as MT_DEVICE_NGNRNE 
resolves the issue. With this change, SCMI works correctly and the i.MX8ULP 
boots successfully.

                 /* SRAM0 (align with 2M) */
                 .virt = 0x22000000UL,
                 .phys = 0x22000000UL,
-               .size = 0x200000UL,
+               .size = 0x1f000UL,
+               .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
+                        PTE_BLOCK_OUTER_SHARE |
+                        PTE_BLOCK_PXN | PTE_BLOCK_UXN
+       }, {
+               .virt = 0x2201f000UL,
+               .phys = 0x2201f000UL,
+               .size = 0x1000UL,
+               .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
+                        PTE_BLOCK_NON_SHARE |
+                        PTE_BLOCK_PXN | PTE_BLOCK_UXN
+       }, {
+               .virt = 0x22020000UL,
+               .phys = 0x22020000UL,
+               .size = 0x1e0000UL,
                 .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
                          PTE_BLOCK_OUTER_SHARE |
                          PTE_BLOCK_PXN | PTE_BLOCK_UXN

Excellent !

Can you please submit a fix like this upstream ?