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Fix usbtiny read/verify for parts with more than 64 kB flash 

Usbtiny has a protocol or firmware problem that prevents it from reading
flash above 64 kB in page mode (used by -U flash:r:... and -U flash✌️...).
This commit fixes that problem by falling back on byte access for flash paged
reads above 64k. It also issues the correct load extended address command for
parts with more than 128 kB flash thus extending support to ATmega2560 et al.
This commit is contained in:
Stefan Rueger 2022-07-16 11:06:18 +01:00
parent c81f52ff10
commit d05ddd188d
1 changed files with 31 additions and 7 deletions
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38
src/usbtiny.c
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@ -657,15 +657,39 @@ static int usbtiny_paged_load (PROGRAMMER * pgm, AVRPART * p, AVRMEM* m,
unsigned int addr, unsigned int n_bytes)
{
unsigned int maxaddr = addr + n_bytes;
int chunk;
int function;
int chunk, function;
OPCODE *lext, *readop;
unsigned char cmd[8];
// First determine what we're doing
if (strcmp( m->desc, "flash" ) == 0) {
function = USBTINY_FLASH_READ;
} else {
function = USBTINY_EEPROM_READ;
function = strcmp(m->desc, "eeprom")==0?
USBTINY_EEPROM_READ: USBTINY_FLASH_READ;
// paged_load() only called for pages, so OK to set ext addr once at start
if((lext = m->op[AVR_OP_LOAD_EXT_ADDR])) {
memset(cmd, 0, sizeof(cmd));
avr_set_bits(lext, cmd);
avr_set_addr(lext, cmd, addr/2);
if(pgm->cmd(pgm, cmd, cmd+4) < 0)
return -1;
}
// Byte acces as work around to correctly read flash above 64 kiB
if(function == USBTINY_FLASH_READ && addr >= 0x10000) {
for(unsigned int i=0; i<n_bytes; i++, addr++) {
if(!(readop = m->op[addr&1? AVR_OP_READ_HI: AVR_OP_READ_LO]))
return -1;
memset(cmd, 0, sizeof(cmd));
avr_set_bits(readop, cmd);
avr_set_addr(readop, cmd, addr/2);
if(pgm->cmd(pgm, cmd, cmd+4) < 0)
return -1;
m->buf[addr] = 0;
avr_get_output(readop, cmd+4, m->buf + addr);
}
return n_bytes;
}
for (; addr < maxaddr; addr += chunk) {