Fix: cleanup and refactor

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-[[!meta title="Libreboot"]]
-
-Also check the [additional references](https://links.fluxo.info/tags/libreboot).
-
-## Important note
-
-From [Libreboot – Installation instructions](https://libreboot.org/docs/install/index.html):
-
-> NOTE: if running flashrom -p internal for software based flashing, and you get
-> an error related to /dev/mem access, you should reboot with iomem=relaxed
-> kernel parameter before running flashrom, or use a kernel that has
-> CONFIG_STRICT_DEVMEM not enabled.
-
-Or you might get errors like this:
-
-    user@x60s:~/code/libreboot/libreboot_r20160907_util/flashrom/i686$ sudo ./flashrom_lenovobios_sst -p internal -r factory.bin
-    flashrom v0.9.9-unknown on Linux 4.9.0-2-686-pae (i686)
-    flashrom is free software, get the source code at https://flashrom.org
-
-    Calibrating delay loop... OK.
-    Found chipset "Intel ICH7M".
-    Enabling flash write... Error accessing ICH RCRB, 0x4000 bytes at 0xfed1c000
-    /dev/mem mmap failed: Operation not permitted
-    FAILED!
-    FATAL ERROR!
-    Error: Programmer initialization failed.
-    user@x60s:~/code/libreboot/libreboot_r20160907_util/flashrom/i686$ sudo ./flashrom_lenovobios_macronix -p internal -r factory.bin
-
-## Pre-compiled binaries
-
-[Get the latest stable release](https://libreboot.org/download.html), check integrity, etc.
-
-In my case I only needed these, which were the latest releases at the time of writing:
-
-* https://mirrors.peers.community/mirrors/libreboot/stable/20160907/SHA512SUMS
-* https://mirrors.peers.community/mirrors/libreboot/stable/20160907/SHA512SUMS.sig
-* https://mirrors.peers.community/mirrors/libreboot/stable/20160907/libreboot_r20160907_util.tar.xz
-* https://mirrors.peers.community/mirrors/libreboot/stable/20160907/rom/grub/libreboot_r20160907_grub_x60.tar.xz
-
-Download and unpack bot libreboot util and rom tarballs. In this example I used the following paths:
-
-* `~/code/libreboot/libreboot_r20160907_util`
-* `~/code/libreboot/roms/libreboot_r20160907_grub_x60`
-
-## Building from source
-
-Just if you need to:
-
-    git clone https://notabug.org/libreboot/libreboot.git && cd libreboot
-    sudo ./oldbuild dependencies trisquel7
-    ./download all
-    ./oldbuild module all
-
-## x60s
-
-This is how I've done. The actual procedure might change without notice :P
-
-### Overview
-
-* Backup the original firmware [like said](https://www.coreboot.org/Board:lenovo/x60/Installation#Back_up_the_original_proprietary_firmware).
-* Then flash the new ROM as [said here](https://libreboot.org/docs/install/#flashrom_lenovobios).
-
-Note this [funny note](https://en.wikibooks.org/wiki/Libreboot/Install/ThinkPad_X60_and_T60)
-on customized and solitary proprietary software:
-
-> While backing up the proprietary BIOS image might be construed as "endorsing"
-> proprietary software: This BIOS image is unique to every motherboard. It will
-> be impossible to restore the original BIOS once it is lost. Back it up now or
-> you will lose it forever. Do not take this decision lightly.
-
-### BIOS Backup
-
-    user@x60s:~/code/libreboot/libreboot_r20160907_util/flashrom/i686$ sudo ./flashrom_lenovobios_sst -p internal -r factory.bin
-    user@x60s:~/code/libreboot/libreboot_r20160907_util/flashrom/i686$ sudo ./flashrom_lenovobios_macronix -p internal -r factory.bin
-
-### Flashing
-
-    user@x60s:~/code/libreboot/libreboot_r20160907_util$ sudo ./flash i945lenovo\_firstflash ../roms/libreboot_r20160907_grub_x60/x60_usqwerty_vesafb.rom
-    Mode selected: i945lenovo_firstflash
-    bucts utility version 'withoutgit'
-    Using LPC bridge 8086:27b9 at 0000:1f.00
-    Current BUC.TS=0 - 128kb address range 0xFFFE0000-0xFFFFFFFF is untranslated
-    Updated BUC.TS=1 - 64kb address ranges at 0xFFFE0000 and 0xFFFF0000 are swapped
-    flashrom v0.9.9-unknown on Linux 4.9.0-2-686-pae (i686)
-    flashrom is free software, get the source code at https://flashrom.org
-
-    Calibrating delay loop... OK.
-    Found chipset "Intel ICH7M".
-    Enabling flash write... WARNING: SPI Configuration Lockdown activated.
-    OK.
-    Found SST flash chip "SST25VF016B" (2048 kB, SPI) mapped at physical address 0xffe00000.
-    Reading old flash chip contents... done.
-    Erasing and writing flash chip... spi_block_erase_20 failed during command execution at address 0x0
-    Reading current flash chip contents... done. Looking for another erase function.
-    spi_block_erase_52 failed during command execution at address 0x0
-    Reading current flash chip contents... done. Looking for another erase function.
-    Transaction error!
-    spi_block_erase_d8 failed during command execution at address 0x1f0000
-    Reading current flash chip contents... done. Looking for another erase function.
-    spi_chip_erase_60 failed during command execution
-    Reading current flash chip contents... done. Looking for another erase function.
-    spi_chip_erase_c7 failed during command execution
-    Looking for another erase function.
-    No usable erase functions left.
-    FAILED!
-    Uh oh. Erase/write failed. Checking if anything has changed.
-    Reading current flash chip contents... done.
-    Apparently at least some data has changed.
-    Your flash chip is in an unknown state.
-    Get help on IRC at chat.freenode.net (channel #flashrom) or
-    mail flashrom@flashrom.org with the subject "FAILED: <your board name>"!
-    -------------------------------------------------------------------------------
-    DO NOT REBOOT OR POWEROFF!
-    flashrom v0.9.9-unknown on Linux 4.9.0-2-686-pae (i686)
-    flashrom is free software, get the source code at https://flashrom.org
-
-    Calibrating delay loop... OK.
-    Found chipset "Intel ICH7M".
-    Enabling flash write... WARNING: SPI Configuration Lockdown activated.
-    OK.
-    No EEPROM/flash device found.
-    Note: flashrom can never write if the flash chip isn't found automatically.
-    user@x60s:~/code/libreboot/libreboot_r20160907_util$
-
-Then reboot the machine, passing "iomem=relaxed" into the kernel command line. Then run the
-second flash:
-
-    user@x60s:~/code/libreboot/libreboot_r20160907_util$ sudo ./flash i945lenovo\_secondflash ../roms/libreboot_r20160907_grub_x60/x60_usqwerty_vesafb.rom
-    Mode selected: i945lenovo_secondflash
-    flashrom v0.9.9-unknown on Linux 4.9.0-2-686-pae (i686)
-    flashrom is free software, get the source code at https://flashrom.org
-
-    Calibrating delay loop... OK.
-    coreboot table found at 0x7be9f000.
-    Found chipset "Intel ICH7M".
-    Enabling flash write... OK.
-    Found SST flash chip "SST25VF016B" (2048 kB, SPI) mapped at physical address 0xffe00000.
-    Reading old flash chip contents... done.
-    Erasing and writing flash chip... Erase/write done.
-    Verifying flash... VERIFIED.
-    bucts utility version 'withoutgit'
-    Using LPC bridge 8086:27b9 at 0000:1f.00
-    Current BUC.TS=1 - 64kb address ranges at 0xFFFE0000 and 0xFFFF0000 are swapped
-    Updated BUC.TS=0 - 128kb address range 0xFFFE0000-0xFFFFFFFF is untranslated
-    user@x60s:~/code/libreboot/libreboot_r20160907_util$
-
-## Issues
-
-* [#870006 - xserver-xorg: X60 libreboot Xorg hangs reproducibly after upgrade to stretch - Debian Bug report logs](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=870006).