Follow-up Comment #1, bug #25929 (project avr-libc):
Problem is most likely not limited to ATtiny48/88. As far as I can tell it
affect also:
ATmega8/16HVA
ATtiny13/13a
ATtiny167
ATtiny2313
ATtiny43
ATtiny87
ATtiny24/44/84
ATtiny25/45/85
ATtiny261/461/861
The following seems to work. Might consider it as a temporary patch.
#include <avr/io.h>
#include <avr/boot.h>
#define __READ_FUSE_LOCK_BIT_SET (_BV(__SPM_ENABLE) | _BV(RFLB))
#define boot_lock_fuse_bits_get_tiny(address)
(__extension__({
uint8_t __result;
__asm__ __volatile__
(
"ldi r30, %3nt"
"ldi r31, 0nt"
"sts %1, %2nt"
"lpm %0, Znt"
: "=r" (__result)
: "i" (_SFR_MEM_ADDR(__SPM_REG)),
"r" ((uint8_t)__READ_FUSE_LOCK_BIT_SET),
"M" (address)
: "r0", "r30", "r31"
);
__result;
}))
I don't have the required chips to test the above, but it match the
datasheet.
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