Discarded input sections

 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .group         0x00000000        0xc build/gpio.o
 .text          0x00000000        0x0 build/gpio.o
 .data          0x00000000        0x0 build/gpio.o
 .bss           0x00000000        0x0 build/gpio.o
 .text.gpio_set_af
                0x00000000       0x98 build/gpio.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .group         0x00000000        0xc build/main.o
 .text          0x00000000        0x0 build/main.o
 .data          0x00000000        0x0 build/main.o
 .bss           0x00000000        0x0 build/main.o
 .debug_macro   0x00000000       0x22 build/main.o
 .debug_macro   0x00000000       0x75 build/main.o
 .debug_macro   0x00000000       0x2a build/main.o
 .debug_macro   0x00000000       0x5c build/main.o
 .debug_macro   0x00000000       0x3c build/main.o
 .debug_macro   0x00000000      0x103 build/main.o
 .debug_macro   0x00000000       0x3a build/main.o
 .debug_macro   0x00000000       0x57 build/main.o
 .debug_macro   0x00000000       0x6a build/main.o
 .debug_macro   0x00000000      0x1df build/main.o
 .debug_macro   0x00000000       0x89 build/main.o
 .debug_macro   0x00000000      0x4cc build/main.o
 .debug_macro   0x00000000       0x22 build/main.o
 .debug_macro   0x00000000       0x40 build/main.o
 .group         0x00000000        0xc build/startup.o
 .group         0x00000000        0xc build/startup.o
 .group         0x00000000        0xc build/startup.o
 .group         0x00000000        0xc build/startup.o
 .group         0x00000000        0xc build/startup.o
 .group         0x00000000        0xc build/startup.o
 .text          0x00000000        0x0 build/startup.o
 .data          0x00000000        0x0 build/startup.o
 .bss           0x00000000        0x0 build/startup.o
 .debug_macro   0x00000000       0x22 build/startup.o
 .debug_macro   0x00000000      0x103 build/startup.o
 .debug_macro   0x00000000       0x6a build/startup.o
 .debug_macro   0x00000000      0x1df build/startup.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .group         0x00000000        0xc build/timer.o
 .text          0x00000000        0x0 build/timer.o
 .data          0x00000000        0x0 build/timer.o
 .bss           0x00000000        0x0 build/timer.o
 .debug_macro   0x00000000       0x22 build/timer.o
 .debug_macro   0x00000000       0x75 build/timer.o
 .debug_macro   0x00000000       0x2a build/timer.o
 .debug_macro   0x00000000       0x5c build/timer.o
 .debug_macro   0x00000000       0x3c build/timer.o
 .debug_macro   0x00000000      0x103 build/timer.o
 .debug_macro   0x00000000       0x3a build/timer.o
 .debug_macro   0x00000000       0x57 build/timer.o
 .debug_macro   0x00000000       0x6a build/timer.o
 .debug_macro   0x00000000      0x1df build/timer.o
 .debug_macro   0x00000000       0x89 build/timer.o
 .debug_macro   0x00000000      0x4cc build/timer.o
 .debug_macro   0x00000000       0x22 build/timer.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .group         0x00000000        0xc build/usart.o
 .text          0x00000000        0x0 build/usart.o
 .data          0x00000000        0x0 build/usart.o
 .bss           0x00000000        0x0 build/usart.o
 .text.usart2_init
                0x00000000       0xb8 build/usart.o
 .text.usart2_start
                0x00000000       0x20 build/usart.o
 .text.usart2_write_byte
                0x00000000       0x30 build/usart.o
 .text.usart2_write
                0x00000000       0x2a build/usart.o
 .debug_info    0x00000000      0x381 build/usart.o
 .debug_abbrev  0x00000000      0x16a build/usart.o
 .debug_aranges
                0x00000000       0x38 build/usart.o
 .debug_rnglists
                0x00000000       0x26 build/usart.o
 .debug_macro   0x00000000      0xb74 build/usart.o
 .debug_macro   0x00000000       0x22 build/usart.o
 .debug_macro   0x00000000       0x75 build/usart.o
 .debug_macro   0x00000000       0x2a build/usart.o
 .debug_macro   0x00000000       0x5c build/usart.o
 .debug_macro   0x00000000       0x3c build/usart.o
 .debug_macro   0x00000000      0x103 build/usart.o
 .debug_macro   0x00000000       0x3a build/usart.o
 .debug_macro   0x00000000       0x57 build/usart.o
 .debug_macro   0x00000000       0x6a build/usart.o
 .debug_macro   0x00000000      0x1df build/usart.o
 .debug_macro   0x00000000       0x89 build/usart.o
 .debug_macro   0x00000000      0x4cc build/usart.o
 .debug_macro   0x00000000      0x130 build/usart.o
 .debug_macro   0x00000000       0x22 build/usart.o
 .debug_macro   0x00000000       0x3a build/usart.o
 .debug_macro   0x00000000       0x5e build/usart.o
 .debug_line    0x00000000      0x179 build/usart.o
 .debug_str     0x00000000     0x5ec2 build/usart.o
 .comment       0x00000000       0x46 build/usart.o
 .debug_line_str
                0x00000000      0x26c build/usart.o
 .debug_frame   0x00000000       0xa0 build/usart.o
 .ARM.attributes
                0x00000000       0x34 build/usart.o

Memory Configuration

Name             Origin             Length             Attributes
flash            0x08000000         0x00080000         xr
sram             0x20000000         0x00020000         xrw
*default*        0x00000000         0xffffffff

Linker script and memory map

LOAD /nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/bin/../lib/gcc/arm-none-eabi/12.3.1/../../../../arm-none-eabi/lib/libc_nano.a
LOAD /nix/store/yr89i11mszv2az19r26l372zgaiivj1c-gcc-arm-embedded-12.3.rel1/bin/../lib/gcc/arm-none-eabi/12.3.1/libgcc.a
LOAD build/gpio.o
LOAD build/main.o
LOAD build/startup.o
LOAD build/timer.o
LOAD build/usart.o
                0x20020000                        stack_start = (ORIGIN (sram) + LENGTH (sram))

.isr_vector     0x08000000      0x198
                0x08000000                        . = ALIGN (0x4)
 *(.isr_vector)
 .isr_vector    0x08000000      0x198 build/startup.o
                0x08000000                interrupt_vector_table
                0x08000198                        . = ALIGN (0x4)

.text           0x08000198      0x34c
                0x08000198                        . = ALIGN (0x4)
 *(.text)
 *(.text.*)
 .text.gpio_set_mode
                0x08000198       0x62 build/gpio.o
                0x08000198                gpio_set_mode
 .text.gpio_write
                0x080001fa       0x4c build/gpio.o
                0x080001fa                gpio_write
 *fill*         0x08000246        0x2 
 .text.system_clock_init
                0x08000248      0x138 build/main.o
 .text.main     0x08000380       0x88 build/main.o
                0x08000380                main
 .text.init_memory
                0x08000408       0x64 build/startup.o
                0x08000408                init_memory
 .text.reset    0x0800046c       0x10 build/startup.o
                0x0800046c                reset
 .text.default_handler
                0x0800047c        0x8 build/startup.o
                0x0800047c                exti0
                0x0800047c                debug_monitor
                0x0800047c                rcc
                0x0800047c                x
                0x0800047c                sdio
                0x0800047c                usage_fault
                0x0800047c                tim1_up_tim10
                0x0800047c                usart1
                0x0800047c                i2c3_er
                0x0800047c                spi2
                0x0800047c                dma1_stream1
                0x0800047c                bus_fault
                0x0800047c                spi5
                0x0800047c                exti3
                0x0800047c                dma2_stream5
                0x0800047c                tim2
                0x0800047c                dma1_stream6
                0x0800047c                default_handler
                0x0800047c                i2c1_er
                0x0800047c                hard_fault
                0x0800047c                usart6
                0x0800047c                exti15_10
                0x0800047c                usart2
                0x0800047c                pend_sv
                0x0800047c                i2c1_ev
                0x0800047c                wwdg
                0x0800047c                adc
                0x0800047c                rtc_alarm
                0x0800047c                spi3
                0x0800047c                exti1
                0x0800047c                mem_manage
                0x0800047c                dma2_stream1
                0x0800047c                dma1_stream2
                0x0800047c                dma2_stream3
                0x0800047c                sv_call
                0x0800047c                tim3
                0x0800047c                otg_fs
                0x0800047c                dma1_stream5
                0x0800047c                dma2_stream6
                0x0800047c                flash
                0x0800047c                tamp_stamp
                0x0800047c                i2c3_ev
                0x0800047c                rtc_wkup
                0x0800047c                dma2_stream0
                0x0800047c                pvd
                0x0800047c                fpu
                0x0800047c                exti4
                0x0800047c                exti2
                0x0800047c                spi1
                0x0800047c                dma1_stream0
                0x0800047c                tim1_brk_tim9
                0x0800047c                i2c2_ev
                0x0800047c                otg_fs_wkup
                0x0800047c                spi4
                0x0800047c                dma2_stream2
                0x0800047c                tim1_cc
                0x0800047c                tim1_trg_com_tim11
                0x0800047c                exti9_5
                0x0800047c                dma1_stream3
                0x0800047c                dma2_stream4
                0x0800047c                i2c2_er
                0x0800047c                dma2_stream7
                0x0800047c                dma1_stream7
                0x0800047c                nmi
                0x0800047c                systick
                0x0800047c                tim4
                0x0800047c                tim5
                0x0800047c                dma1_stream4
 .text.tim4_init
                0x08000484       0x40 build/timer.o
                0x08000484                tim4_init
 .text.tim4_start
                0x080004c4       0x20 build/timer.o
                0x080004c4                tim4_start
 *(.rodata)
 *(.rodata.*)
                0x080004e4                        . = ALIGN (0x4)
                0x080004e4                        _data_addr = LOADADDR (.data)

.glue_7         0x080004e4        0x0
 .glue_7        0x080004e4        0x0 linker stubs

.glue_7t        0x080004e4        0x0
 .glue_7t       0x080004e4        0x0 linker stubs

.vfp11_veneer   0x080004e4        0x0
 .vfp11_veneer  0x080004e4        0x0 linker stubs

.v4_bx          0x080004e4        0x0
 .v4_bx         0x080004e4        0x0 linker stubs

.iplt           0x080004e4        0x0
 .iplt          0x080004e4        0x0 build/main.o

.rel.dyn        0x080004e4        0x0
 .rel.iplt      0x080004e4        0x0 build/main.o

.data           0x20000000        0x0 load address 0x080004e4
                0x20000000                        . = ALIGN (0x4)
                0x20000000                        _data_start = .
 *(.data)
 *(.data.*)
                0x20000000                        . = ALIGN (0x4)
                0x20000000                        _data_end = .

.igot.plt       0x20000000        0x0 load address 0x080004e4
 .igot.plt      0x20000000        0x0 build/main.o

.bss            0x20000000        0x0 load address 0x080004e4
                0x20000000                        . = ALIGN (0x4)
                0x20000000                        _bss_start = .
 *(.bss)
 *(.bss.*)
                0x20000000                        _bss_end = .
                0x20000000                        . = ALIGN (0x4)
OUTPUT(build/final.elf elf32-littlearm)
LOAD linker stubs

.debug_info     0x00000000      0xb6d
 .debug_info    0x00000000      0x262 build/gpio.o
 .debug_info    0x00000262      0x44e build/main.o
 .debug_info    0x000006b0      0x188 build/startup.o
 .debug_info    0x00000838      0x335 build/timer.o

.debug_abbrev   0x00000000      0x43d
 .debug_abbrev  0x00000000      0x11d build/gpio.o
 .debug_abbrev  0x0000011d      0x144 build/main.o
 .debug_abbrev  0x00000261      0x127 build/startup.o
 .debug_abbrev  0x00000388       0xb5 build/timer.o

.debug_aranges  0x00000000       0xb0
 .debug_aranges
                0x00000000       0x30 build/gpio.o
 .debug_aranges
                0x00000030       0x28 build/main.o
 .debug_aranges
                0x00000058       0x30 build/startup.o
 .debug_aranges
                0x00000088       0x28 build/timer.o

.debug_rnglists
                0x00000000       0x73
 .debug_rnglists
                0x00000000       0x20 build/gpio.o
 .debug_rnglists
                0x00000020       0x1b build/main.o
 .debug_rnglists
                0x0000003b       0x1f build/startup.o
 .debug_rnglists
                0x0000005a       0x19 build/timer.o

.debug_macro    0x00000000     0x3bc4
 .debug_macro   0x00000000      0xb56 build/gpio.o
 .debug_macro   0x00000b56       0x22 build/gpio.o
 .debug_macro   0x00000b78       0x75 build/gpio.o
 .debug_macro   0x00000bed       0x2a build/gpio.o
 .debug_macro   0x00000c17       0x5c build/gpio.o
 .debug_macro   0x00000c73       0x3c build/gpio.o
 .debug_macro   0x00000caf      0x103 build/gpio.o
 .debug_macro   0x00000db2       0x3a build/gpio.o
 .debug_macro   0x00000dec       0x57 build/gpio.o
 .debug_macro   0x00000e43       0x6a build/gpio.o
 .debug_macro   0x00000ead      0x1df build/gpio.o
 .debug_macro   0x0000108c       0x89 build/gpio.o
 .debug_macro   0x00001115      0x4cc build/gpio.o
 .debug_macro   0x000015e1       0x22 build/gpio.o
 .debug_macro   0x00001603       0x40 build/gpio.o
 .debug_macro   0x00001643      0xb80 build/main.o
 .debug_macro   0x000021c3      0x136 build/main.o
 .debug_macro   0x000022f9       0x46 build/main.o
 .debug_macro   0x0000233f       0x2e build/main.o
 .debug_macro   0x0000236d       0x22 build/main.o
 .debug_macro   0x0000238f      0xb02 build/startup.o
 .debug_macro   0x00002e91       0x56 build/startup.o
 .debug_macro   0x00002ee7       0x51 build/startup.o
 .debug_macro   0x00002f38      0xb5c build/timer.o
 .debug_macro   0x00003a94      0x130 build/timer.o

.debug_line     0x00000000      0x516
 .debug_line    0x00000000      0x179 build/gpio.o
 .debug_line    0x00000179      0x1d4 build/main.o
 .debug_line    0x0000034d       0xea build/startup.o
 .debug_line    0x00000437       0xdf build/timer.o

.debug_str      0x00000000     0x5f5e
 .debug_str     0x00000000     0x53c1 build/gpio.o
                               0x5571 (size before relaxing)
 .debug_str     0x000053c1      0xb09 build/main.o
                               0x600c (size before relaxing)
 .debug_str     0x00005eca       0x88 build/startup.o
                               0x3cdc (size before relaxing)
 .debug_str     0x00005f52        0xc build/timer.o
                               0x5b6e (size before relaxing)

.comment        0x00000000       0x45
 .comment       0x00000000       0x45 build/gpio.o
                                 0x46 (size before relaxing)
 .comment       0x00000045       0x46 build/main.o
 .comment       0x00000045       0x46 build/startup.o
 .comment       0x00000045       0x46 build/timer.o

.ARM.attributes
                0x00000000       0x34
 .ARM.attributes
                0x00000000       0x34 build/gpio.o
 .ARM.attributes
                0x00000034       0x34 build/main.o
 .ARM.attributes
                0x00000068       0x34 build/startup.o
 .ARM.attributes
                0x0000009c       0x34 build/timer.o

.debug_line_str
                0x00000000      0x280
 .debug_line_str
                0x00000000      0x24b build/gpio.o
                                0x25d (size before relaxing)
 .debug_line_str
                0x0000024b       0x23 build/main.o
                                0x279 (size before relaxing)
 .debug_line_str
                0x0000026e        0xa build/startup.o
                                0x218 (size before relaxing)
 .debug_line_str
                0x00000278        0x8 build/timer.o
                                0x25b (size before relaxing)

.debug_frame    0x00000000      0x194
 .debug_frame   0x00000000       0x88 build/gpio.o
 .debug_frame   0x00000088       0x50 build/main.o
 .debug_frame   0x000000d8       0x6c build/startup.o
 .debug_frame   0x00000144       0x50 build/timer.o