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Only assert_not_corrupted_read if we read from the second bank

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This commit is contained in:
Rasmus Melchior Jacobsen 2023-05-25 22:31:24 +02:00
parent 8528455a75
commit ce331b411c
2 changed files with 12 additions and 10 deletions
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7
embassy-stm32/src/flash/common.rs
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@ -97,10 +97,11 @@ pub(super) fn blocking_read(base: u32, size: u32, offset: u32, bytes: &mut [u8])
return Err(Error::Size);
}
#[cfg(flash_f4)]
family::assert_not_corrupted_read();
let start_address = base + offset;
#[cfg(flash_f4)]
family::assert_not_corrupted_read(start_address + bytes.len());
let flash_data = unsafe { core::slice::from_raw_parts(start_address as *const u8, bytes.len()) };
bytes.copy_from_slice(flash_data);
Ok(())

15
embassy-stm32/src/flash/f4.rs
View file

@ -6,6 +6,7 @@ use atomic_polyfill::AtomicBool;
#[cfg(feature = "nightly")]
use embassy_sync::waitqueue::AtomicWaker;
use pac::flash::regs::Sr;
use pac::FLASH_SIZE;
use super::{FlashBank, FlashRegion, FlashSector, FLASH_REGIONS, WRITE_SIZE};
use crate::flash::Error;
@ -437,10 +438,13 @@ fn restore_data_cache_state() {
}
}
pub(crate) fn assert_not_corrupted_read() {
pub(crate) fn assert_not_corrupted_read(end_address: u32) {
#[allow(unused)]
const REVISION_3: u16 = 0x2001;
#[allow(unused)]
let second_bank_read = get_flash_regions().last().unwrap().bank == FlashBank::Bank2 && end_address > FLASH_SIZE / 2;
#[cfg(any(
feature = "stm32f427ai",
feature = "stm32f427ii",
@ -463,7 +467,7 @@ pub(crate) fn assert_not_corrupted_read() {
feature = "stm32f439vi",
feature = "stm32f439zi",
))]
if unsafe { pac::DBGMCU.idcode().read().rev_id() < REVISION_3 && !pa12_is_output_pull_low() } {
if second_bank_read && unsafe { pac::DBGMCU.idcode().read().rev_id() < REVISION_3 && !pa12_is_output_pull_low() } {
panic!("Read corruption for stm32f42xxI and stm32f43xxI when PA12 is in use for chips below revision 3, see errata 2.2.11");
}
@ -487,11 +491,8 @@ pub(crate) fn assert_not_corrupted_read() {
feature = "stm32f439vg",
feature = "stm32f439zg",
))]
if unsafe {
pac::FLASH.optcr().read().db1m()
&& pac::DBGMCU.idcode().read().rev_id() < REVISION_3
&& !pa12_is_output_pull_low()
} {
if second_bank_read && unsafe { &&pac::DBGMCU.idcode().read().rev_id() < REVISION_3 && !pa12_is_output_pull_low() }
{
panic!("Read corruption for stm32f42xxG and stm32f43xxG in dual bank mode when PA12 is in use for chips below revision 3, see errata 2.2.11");
}
}