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
 .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
 .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       0x88 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
 .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      0x13e build/usart.o
 .debug_macro   0x00000000       0x22 build/usart.o
 .debug_macro   0x00000000       0x82 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      0x4e4
                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      0x144 build/main.o
 .text.main     0x0800038c       0x9c build/main.o
                0x0800038c                main
 .text.init_memory
                0x08000428       0x64 build/startup.o
                0x08000428                init_memory
 .text.reset    0x0800048c       0x10 build/startup.o
                0x0800048c                reset
 .text.default_handler
                0x0800049c        0x8 build/startup.o
                0x0800049c                exti0
                0x0800049c                debug_monitor
                0x0800049c                rcc
                0x0800049c                x
                0x0800049c                sdio
                0x0800049c                usage_fault
                0x0800049c                tim1_up_tim10
                0x0800049c                usart1
                0x0800049c                i2c3_er
                0x0800049c                spi2
                0x0800049c                dma1_stream1
                0x0800049c                bus_fault
                0x0800049c                spi5
                0x0800049c                exti3
                0x0800049c                dma2_stream5
                0x0800049c                tim2
                0x0800049c                dma1_stream6
                0x0800049c                default_handler
                0x0800049c                i2c1_er
                0x0800049c                hard_fault
                0x0800049c                usart6
                0x0800049c                exti15_10
                0x0800049c                usart2
                0x0800049c                pend_sv
                0x0800049c                i2c1_ev
                0x0800049c                wwdg
                0x0800049c                adc
                0x0800049c                rtc_alarm
                0x0800049c                spi3
                0x0800049c                exti1
                0x0800049c                mem_manage
                0x0800049c                dma2_stream1
                0x0800049c                dma1_stream2
                0x0800049c                dma2_stream3
                0x0800049c                sv_call
                0x0800049c                tim3
                0x0800049c                otg_fs
                0x0800049c                dma1_stream5
                0x0800049c                dma2_stream6
                0x0800049c                flash
                0x0800049c                tamp_stamp
                0x0800049c                i2c3_ev
                0x0800049c                rtc_wkup
                0x0800049c                dma2_stream0
                0x0800049c                pvd
                0x0800049c                fpu
                0x0800049c                exti4
                0x0800049c                exti2
                0x0800049c                spi1
                0x0800049c                dma1_stream0
                0x0800049c                tim1_brk_tim9
                0x0800049c                i2c2_ev
                0x0800049c                otg_fs_wkup
                0x0800049c                spi4
                0x0800049c                dma2_stream2
                0x0800049c                tim1_cc
                0x0800049c                tim1_trg_com_tim11
                0x0800049c                exti9_5
                0x0800049c                dma1_stream3
                0x0800049c                dma2_stream4
                0x0800049c                i2c2_er
                0x0800049c                dma2_stream7
                0x0800049c                dma1_stream7
                0x0800049c                nmi
                0x0800049c                systick
                0x0800049c                tim4
                0x0800049c                tim5
                0x0800049c                dma1_stream4
 .text.tim4_init
                0x080004a4       0x40 build/timer.o
                0x080004a4                tim4_init
 .text.tim4_start
                0x080004e4       0x20 build/timer.o
                0x080004e4                tim4_start
 .text.usart2_init
                0x08000504       0xec build/usart.o
                0x08000504                usart2_init
 .text.usart2_start
                0x080005f0       0x20 build/usart.o
                0x080005f0                usart2_start
 .text.usart2_write_byte
                0x08000610       0x30 build/usart.o
                0x08000610                usart2_write_byte
 .text.usart2_write
                0x08000640       0x2a build/usart.o
                0x08000640                usart2_write
 *(.rodata)
 *fill*         0x0800066a        0x2 
 .rodata        0x0800066c        0xe build/main.o
 *(.rodata.*)
                0x0800067c                        . = ALIGN (0x4)
 *fill*         0x0800067a        0x2 
                0x0800067c                        _data_addr = LOADADDR (.data)

.glue_7         0x0800067c        0x0
 .glue_7        0x0800067c        0x0 linker stubs

.glue_7t        0x0800067c        0x0
 .glue_7t       0x0800067c        0x0 linker stubs

.vfp11_veneer   0x0800067c        0x0
 .vfp11_veneer  0x0800067c        0x0 linker stubs

.v4_bx          0x0800067c        0x0
 .v4_bx         0x0800067c        0x0 linker stubs

.iplt           0x0800067c        0x0
 .iplt          0x0800067c        0x0 build/main.o

.rel.dyn        0x0800067c        0x0
 .rel.iplt      0x0800067c        0x0 build/main.o

.data           0x20000000        0x0 load address 0x0800067c
                0x20000000                        . = ALIGN (0x4)
                0x20000000                        _data_start = .
 *(.data)
 *(.data.*)
                0x20000000                        . = ALIGN (0x4)
                0x20000000                        _data_end = .

.igot.plt       0x20000000        0x0 load address 0x0800067c
 .igot.plt      0x20000000        0x0 build/main.o

.bss            0x20000000        0x0 load address 0x0800067c
                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      0xeb1
 .debug_info    0x00000000      0x205 build/gpio.o
 .debug_info    0x00000205      0x47e build/main.o
 .debug_info    0x00000683      0x188 build/startup.o
 .debug_info    0x0000080b      0x335 build/timer.o
 .debug_info    0x00000b40      0x371 build/usart.o

.debug_abbrev   0x00000000      0x547
 .debug_abbrev  0x00000000      0x119 build/gpio.o
 .debug_abbrev  0x00000119      0x14b build/main.o
 .debug_abbrev  0x00000264      0x127 build/startup.o
 .debug_abbrev  0x0000038b       0xb5 build/timer.o
 .debug_abbrev  0x00000440      0x107 build/usart.o

.debug_aranges  0x00000000       0xe0
 .debug_aranges
                0x00000000       0x28 build/gpio.o
 .debug_aranges
                0x00000028       0x28 build/main.o
 .debug_aranges
                0x00000050       0x30 build/startup.o
 .debug_aranges
                0x00000080       0x28 build/timer.o
 .debug_aranges
                0x000000a8       0x38 build/usart.o

.debug_rnglists
                0x00000000       0x92
 .debug_rnglists
                0x00000000       0x19 build/gpio.o
 .debug_rnglists
                0x00000019       0x1b build/main.o
 .debug_rnglists
                0x00000034       0x1f build/startup.o
 .debug_rnglists
                0x00000053       0x19 build/timer.o
 .debug_rnglists
                0x0000006c       0x26 build/usart.o

.debug_macro    0x00000000     0x48a9
 .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       0x88 build/gpio.o
 .debug_macro   0x0000168b      0xb89 build/main.o
 .debug_macro   0x00002214      0x144 build/main.o
 .debug_macro   0x00002358       0x46 build/main.o
 .debug_macro   0x0000239e       0x2e build/main.o
 .debug_macro   0x000023cc       0x22 build/main.o
 .debug_macro   0x000023ee       0x82 build/main.o
 .debug_macro   0x00002470      0xb02 build/startup.o
 .debug_macro   0x00002f72       0x56 build/startup.o
 .debug_macro   0x00002fc8       0x51 build/startup.o
 .debug_macro   0x00003019      0xb5c build/timer.o
 .debug_macro   0x00003b75      0x13e build/timer.o
 .debug_macro   0x00003cb3      0xb74 build/usart.o
 .debug_macro   0x00004827       0x82 build/usart.o

.debug_line     0x00000000      0x661
 .debug_line    0x00000000      0x116 build/gpio.o
 .debug_line    0x00000116      0x1e4 build/main.o
 .debug_line    0x000002fa       0xea build/startup.o
 .debug_line    0x000003e4       0xdf build/timer.o
 .debug_line    0x000004c3      0x19e build/usart.o

.debug_str      0x00000000     0x63e6
 .debug_str     0x00000000     0x5508 build/gpio.o
                               0x56b0 (size before relaxing)
 .debug_str     0x00005508      0xe17 build/main.o
                               0x6477 (size before relaxing)
 .debug_str     0x0000631f       0x88 build/startup.o
                               0x3cdc (size before relaxing)
 .debug_str     0x000063a7        0xc build/timer.o
                               0x5bc2 (size before relaxing)
 .debug_str     0x000063b3       0x33 build/usart.o
                               0x60ec (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
 .comment       0x00000045       0x46 build/usart.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
 .ARM.attributes
                0x000000d0       0x34 build/usart.o

.debug_line_str
                0x00000000      0x290
 .debug_line_str
                0x00000000      0x24b build/gpio.o
                                0x25d (size before relaxing)
 .debug_line_str
                0x0000024b       0x2b build/main.o
                                0x281 (size before relaxing)
 .debug_line_str
                0x00000276        0xa build/startup.o
                                0x218 (size before relaxing)
 .debug_line_str
                0x00000280        0x8 build/timer.o
                                0x25b (size before relaxing)
 .debug_line_str
                0x00000288        0x8 build/usart.o
                                0x26c (size before relaxing)

.debug_frame    0x00000000      0x208
 .debug_frame   0x00000000       0x60 build/gpio.o
 .debug_frame   0x00000060       0x50 build/main.o
 .debug_frame   0x000000b0       0x6c build/startup.o
 .debug_frame   0x0000011c       0x50 build/timer.o
 .debug_frame   0x0000016c       0x9c build/usart.o