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ESP32-S3: Fix PSRAM start address calculation (#2880)

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* ESP32-S3: Fix PSRAM start address calculation

* Change code for clarity

* Explain

* Link to esp-idf docs
This commit is contained in:
Björn Quentin 2025-01-14 09:57:05 +01:00 committed by GitHub
parent 0bf6e4606b
commit 8fb9fbddd5
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1 changed files with 11 additions and 5 deletions
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16
esp-hal/src/soc/esp32s3/psram.rs
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@ -169,15 +169,21 @@ pub(crate) fn init_psram(config: PsramConfig) {
const DR_REG_MMU_TABLE: u32 = 0x600C5000;
// calculate the PSRAM start address to map
let mut start = EXTMEM_ORIGIN;
// the linker scripts can produce a gap between mapped IROM and DROM segments
// bigger than a flash page - i.e. we will see an unmapped memory slot
// start from the end and find the last mapped flash page
//
// More general information about the MMU can be found here:
// https://docs.espressif.com/projects/esp-idf/en/stable/esp32s3/api-reference/system/mm.html#introduction
let mmu_table_ptr = DR_REG_MMU_TABLE as *const u32;
for i in 0..FLASH_MMU_TABLE_SIZE {
let mut mapped_pages = 0;
for i in (0..FLASH_MMU_TABLE_SIZE).rev() {
if mmu_table_ptr.add(i).read_volatile() != MMU_INVALID {
start += MMU_PAGE_SIZE;
} else {
mapped_pages = (i + 1) as u32;
break;
}
}
let start = EXTMEM_ORIGIN + (MMU_PAGE_SIZE * mapped_pages);
debug!("PSRAM start address = {:x}", start);
// Configure the mode of instruction cache : cache size, cache line size.
@ -187,7 +193,7 @@ pub(crate) fn init_psram(config: PsramConfig) {
CONFIG_ESP32S3_INSTRUCTION_CACHE_LINE_SIZE,
);
// If we need use SPIRAM, we should use data cache.Connfigure the mode of data :
// If we need use SPIRAM, we should use data cache.Configure the mode of data :
// cache size, cache line size.
Cache_Suspend_DCache();