Sat 10 Sep 2005 07:01:10 AM UTC, original submission:
Hi
I have a problem with programing the bootloader. I am using atmega128, avrlibc 1.2.5, avr-gcc 4.0.1, binutils 2.16.1. Linker report problem with undefined reference 'Y'. This problem is in function boot_page_erase(addr) from boot .h. I will explain my problem on two examples.
First instance of call boot_page_erase():
51:program.c **** boot_page_erase (70);
80 .LM2:
81 /* #NOAPP */
82 0008 23E0 ldi r18,lo8(3)
83 000a 86E4 ldi r24,lo8(70)
84 000c 90E0 ldi r25,hi8(70)
85 000e A0E0 ldi r26,hlo8(70)
86 0010 B0E0 ldi r27,hhi8(70)
87 /* #APP */
88 0012 FC01 movw r30, r24
89 0014 A093 5B00 sts 91, r26
90 0018 2093 6800 sts 104, r18
91 001c E895 spm
When I am calling this function for second time compiler produces this:
131 004e C8E6 ldi r28,lo8(104)
132 0050 D0E0 ldi r29,hi8(104)
133 0052 93E0 ldi r25,lo8(3)
134 0054 A8E6 ldi r26,lo8(104)
135 0056 B0E0 ldi r27,hi8(104)
136 .L8:
69:program.c **** // erase only main section (bootloader protection)
70:program.c **** address = 0; 71:program.c **** while ( address < 0x1dfff ){
72:program.c **** // Perform page erase
73:program.c **** boot_page_erase (address);
138 .LM10:
139 /* #APP */
140 0058 F901 movw r30, r18
141 005a 4093 5B00 sts 91, r20
142 005e 9093 0000 sts Y, r25 <<--PROBLEM
143 0062 E895 spm
Problem is in call sts Y,r25. Compiler loads 104 which is addres of SPM_REG but you cannot write to Y with sts only with st. If you look into boot.h there is output operators "=m". What do they stand for. I haven't found any documentatio for them. How can you force the compiler to do correct code.
Same problem is with boot_rww_enable();
Cheers,
Rok
ps: Bjorn Hasse showed me a solution and it is working.
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