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cortexm: Fix protected SAM detection 

- Only run cortex_prepare() if reading cidr fails
- With Atmel DSU detected, run cortexm_probe()
This commit is contained in:
Uwe Bonnes 2020-10-14 23:48:41 +02:00 committed by UweBonnes
parent 5bc743d221
commit 0ffb4f7b18
1 changed files with 13 additions and 19 deletions
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32
src/target/adiv5.c
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@ -409,6 +409,15 @@ static bool adiv5_component_probe(ADIv5_AP_t *ap, uint32_t addr, int recursion,
if (addr == 0) /* No rom table on this AP */
return false;
uint32_t cidr = adiv5_ap_read_id(ap, addr + CIDR0_OFFSET);
if ((cidr & ~CID_CLASS_MASK) != CID_PREAMBLE) {
/* Maybe caused by a not halted CortexM */
if (!ap->apsel && ((ap->idr & 0xf) == ARM_AP_TYPE_AHB)) {
if (!cortexm_prepare(ap))
return false; /* Halting failed! */
/* CPU now halted, read cidr again. */
cidr = adiv5_ap_read_id(ap, addr + CIDR0_OFFSET);
}
}
bool res = false;
#if defined(ENABLE_DEBUG)
char indent[recursion + 1];
@ -454,6 +463,10 @@ static bool adiv5_component_probe(ADIv5_AP_t *ap, uint32_t addr, int recursion,
if (recursion == 0) {
ap->ap_designer = designer;
ap->ap_partno = partno;
if ((ap->ap_designer == AP_DESIGNER_ATMEL) && (ap->ap_partno == 0xcd0)) {
cortexm_probe(ap);
return true;
}
}
for (int i = 0; i < 960; i++) {
adiv5_dp_error(ap->dp);
@ -598,25 +611,6 @@ ADIv5_AP_t *adiv5_new_ap(ADIv5_DP_t *dp, uint8_t apsel)
DEBUG_INFO("AP %3d: IDR=%08"PRIx32" CFG=%08"PRIx32" BASE=%08" PRIx32
" CSW=%08"PRIx32"\n", apsel, ap->idr, cfg, ap->base, ap->csw);
#endif
if (!apsel && ((ap->idr & 0xf) == ARM_AP_TYPE_AHB)) {
/* Test for protected Atmel devices. Access outside DSU fails.
* For protected device, continue with Rom Table anyways.
*/
adiv5_dp_error(ap->dp);
adiv5_mem_read32(ap, CORTEXM_DHCSR);
if ( adiv5_dp_error(ap->dp) & ADIV5_DP_CTRLSTAT_STICKYERR) {
uint32_t err = adiv5_dp_error(ap->dp);
if (err & ADIV5_DP_CTRLSTAT_STICKYERR) {
DEBUG_WARN("...\nHit error on DHCSR read. Suspect protected Atmel "
"part, skipping to PIDR check.\n");
}
} else {
if (!cortexm_prepare(ap)) {
free(ap);
return NULL;
}
}
}
adiv5_ap_ref(ap);
return ap;
}