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rp: fix multicore stack guard setup

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the region field of the register is four bits wide followed by the valid
bit that causes the rnr update we rely on for the rasr write. 0x08 is
just a bit short to reach the valid bit, and since rp2040 has only 8
regions it (at best) doesn't do anything at all.
This commit is contained in:
pennae 2023-07-20 16:08:59 +02:00
parent 3382ca1a54
commit 4d6b3c57b1
1 changed files with 1 additions and 1 deletions
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embassy-rp/src/multicore.rs
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@ -74,7 +74,7 @@ fn install_stack_guard(stack_bottom: *mut usize) {
let subregion_select = 0xff ^ (1 << ((addr >> 5) & 7)); let subregion_select = 0xff ^ (1 << ((addr >> 5) & 7));
unsafe { unsafe {
core.MPU.ctrl.write(5); // enable mpu with background default map core.MPU.ctrl.write(5); // enable mpu with background default map
core.MPU.rbar.write((addr & !0xff) | 0x8); core.MPU.rbar.write((addr & !0xff) | (1 << 4)); // set address and update RNR
core.MPU.rasr.write( core.MPU.rasr.write(
1 // enable region 1 // enable region
| (0x7 << 1) // size 2^(7 + 1) = 256 | (0x7 << 1) // size 2^(7 + 1) = 256