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Add bootloader and vector write protection

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This commit is contained in:
Stefan Rueger
2026-04-03 01:49:16 +01:00
parent bcb993f204
commit 37bc0afad7
1 changed files with 26 additions and 3 deletions
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29
src/dryrun.c
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@@ -91,7 +91,7 @@ static int dryrun_init_ur(const PROGRAMMER *pgm, const AVRPART *p) {
Return("cannot locate flash memory for %s\n", p->desc);
// No urboot bootloaders on AVR32 parts, neither on really small devices
if(is_awire(p) || flm->size < 512)
if(is_awire(p) || flm->size < 1024)
return 0;
if(!is_updi(p)) {
@@ -120,6 +120,7 @@ static int dryrun_init_ur(const PROGRAMMER *pgm, const AVRPART *p) {
if(isop(rjmpwp, ret) || (dfromend >= -blsize && dfromend < -6)) { // urboot!
ur.blstart = flm->size - blsize;
ur.blend = flm->size - 1;
ur.pfstart = 0;
ur.pfend = ur.blstart - 1;
ur.vectornum = vectnum;
ur.urversion = urver;
@@ -1173,7 +1174,6 @@ static void dryrun_display(const PROGRAMMER *pgm, const char *p_unused) {
// Return whether an address is write protected
static int dryrun_readonly(const PROGRAMMER *pgm, const AVRPART *p, const AVRMEM *mem, unsigned int addr) {
if(mem_is_readonly(mem))
return 1;
@@ -1183,7 +1183,30 @@ static int dryrun_readonly(const PROGRAMMER *pgm, const AVRPART *p, const AVRMEM
return 0;
}
// @@@ check for bootloader write protection
// Bootloader
if(mem_is_in_flash(mem) && !mem_is_apptable(mem)) {
const AVRMEM *m;
// Translate XMEGA boot addresses to flash addresses
if(is_pdi(p) && mem_is_boot(mem) && (m = avr_locate_application(p)))
addr += m->size;
if(addr > (unsigned int) ur.pfend)
return 1;
if(addr < (unsigned int) ur.pfstart)
return 1;
// Vector table
if(!is_updi(p) && addr < 512 && ur.vectornum > 0) {
unsigned int vecsz = (m = avr_locate_flash(p)) && m->size <= 8192? 2u: 4u;
unsigned int appvecloc = ur.vectornum*vecsz;
if(addr < vecsz)
return 1;
if(addr >= appvecloc && addr < appvecloc+vecsz)
return 1;
}
} else if(is_classic(p) && !mem_is_eeprom(mem))
return 1;
if(dry.initialised && (mem_is_in_fuses(mem) || mem_is_lock(mem)))
return 1;