64 lines
2.3 KiB
Markdown
64 lines
2.3 KiB
Markdown
---
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title: GA-G41M-ES2L flashing tutorial
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x-unreviewed: true
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...
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This guide is for those who want libreboot on their Intel GA-G41M-ES2L
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motherboard while they still have the original BIOS present.
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Flash chip size {#flashchips}
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===============
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Use this to find out:
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flashrom -p internal
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Flashing instructions {#clip}
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=====================
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Refer to [spi.md](spi.md) for how to set up an SPI programmer for
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external flashing. *You can only externally reprogram one of the chips
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at a time, and you need to disable the chip that you're not flashing,
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by connecting 3v3 to /CS of that chip, so you will actually need second test
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clip or IC pin mini grabber.*
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NOTE: on GA-G41M-ES2L, the flash shares a common voltage plane with the
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southbridge, which draws a lot of current. This will cause under-voltage on
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most SPI flashers, so do not use the 3.3V rail from your flasher. Do not
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connect +3.3V to the chip. Instead, turn the board on and then turn it off by
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holding the power button. With the board powered down, but plugged in, there
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will be a 3.3V supply from the ATX PSU. You can then flash, but DO NOT connect
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the +3.3V supply from your SPI flasher!
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NOTE: You should use a resistor in series, between 1K to 10K ohms, for the 3.3v
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connection to the CS pin. This is to protect from over-current.
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Here is an image of the flash chip:\
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Internal flashing is possible. Boot with the proprietary BIOS and
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GNU+Linux. There are 2 flash chips (one is backup).
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Flash the first chip:
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./flashrom -p internal:dualbiosindex=0 -w libreboot.rom
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Flash the second chip:
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./flashrom -p internal:dualbiosindex=1 -w libreboot.rom
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NOTE: you can still boot the system with just the main flash chip
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connected, after desoldering the backup chip. This has been tested while
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libreboot was already installed onto the main chip.
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NOTE: If you don't flash both chips, the recovery program from the default
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factory BIOS will kick in and your board will be soft bricked. Make sure that
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you flash both chips!
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NOTE: You need the latest flashrom. Just get it on flashrom.org from
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their SVN or Git repos.
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NOTE: due to a bug in the hardware, the MAC address is hardcoded in
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coreboot-libre. Therefore, you must set your own MAC address in your
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operating system.
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