From 13e24d7afac0213bf5cbccbb314a410c1f622a77 Mon Sep 17 00:00:00 2001
From: eliot <eliot@web>
Date: Sat, 1 Feb 2020 19:00:27 +0100
Subject: [PATCH] Added readme for building and flashing t400 coreboot

---
 guider.mdwn | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 65 insertions(+), 1 deletion(-)

diff --git a/guider.mdwn b/guider.mdwn
index 485727e..2a98c2b 100644
--- a/guider.mdwn
+++ b/guider.mdwn
@@ -1,5 +1,70 @@
 [[!toc levels=3]]
 
+## Coreboot for T400 without blobs
+    #!/bin/bash -e
+    #Building Coreboot without blobs for T400
+    #Assumed 8MB rom (can use ./flashrom -p internal to see this on the proprietary T400)
+    #If not 8MB just change size in menuconfig and take other .bin from ich9gen, no problem
+    
+    
+    # See also https://www.coreboot.org/Build_HOWTO#debian
+    apt update && apt upgrade -y
+    apt-get install git build-essential gnat flex bison libncurses5-dev wget zlib1g-dev -y
+    
+    # CLONE 
+    git clone https://review.coreboot.org/coreboot
+    cd coreboot
+    git submodule update --init --checkout
+    
+    #You can copy our config and use it if you wish
+    #cp coreboot_config_t400_8mb coreboot/.config
+    
+    # CONFIGURE
+    # In this menu config set wanted settings (see our config, or the guide for T400 by zerocat http://www.zerocat.org/projects/coreboot-machines/doc/generated-documentation/html/md_doc_build-coreboot-t400.html)
+    # Our final conf is in ~/coreboot_config_t400_8mb
+    # NOTE: we add descriptor for gbit ethernet later (NO need for "add Intel descriptor.bin file")
+    make menuconfig #or make nconfig
+    
+    # BUILD toolchain
+    make crossgcc-x64 CPUS=2
+    #or make crossgcc CPUS=2 #for all architectures
+    
+    # BUILD rom
+    make
+    cp build/coreboot.rom ~/t400_8mb_coreboot_notReady.rom
+    
+    
+    # DESCRIPTOR
+    # We add the gbit ethernet descriptor with the tool provided by libreboot
+    git clone https://notabug.org/libreboot/libreboot
+    cd libreboot
+    ./oldbuild module ich9deblob
+    cd resources/utilities/ich9deblob/
+    
+    #NOTE: SET YOUROWN MAC HERE! Should be unique, just take the one which is under the T400
+    ./ich9gen --mac-address 00:24:7E:AA:AA:AA
+    
+    cp ~/t400_8mb_coreboot_notReady.rom ~/t400_8mb_coreboot_flashable.rom
+    dd if=ich9fdgbe_8m.bin of=t400_8mb_coreboot_flashable.rom bs=12k count=1 conv=notrunc
+    
+    exit 
+    
+    # ROM IS READY! 
+    # NEXT STEPS ARE DONE ON EXTERNAL DEVICE (we used BeagleBoneBlack)
+    # See libreboot for external flash, just disassemble laptops (can take a few hours) -> https://libreboot.org/docs/install/t400_external.html
+    # Flash with for example BBB: https://libreboot.org/docs/install/bbb_setup.html
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=512 -r factory1.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=1024 -r factory2.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=1024 -r factory3.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=256 -r factory4.rom
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=2048 -r factory5.rom
+    sha256sum factory*.rom #a majority should match, or at least 2 should have the same hash 
+    
+    ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=512 -w ~/t400_8mb_coreboot_flashable.rom
+    #Should say "Verified". If you're paranoid you could read it again and check hash.
+    
+
+
 ##GRUB
 ###Boot manually
 For some setups the default GRUB script does not work. Either try updating the grub.cfg (next section) or boot manually (below).
@@ -161,7 +226,6 @@ Unlike Coreboot, this build process is fairly automated and does not present any
     ## LASTLY FLASH TO CHIP (here internally)
     #sudo ./flashrom/flashrom -p internal -w x200.rom
     
-
 ###X200
 ####Flashing Internally
 To internally flash your ROM use the kernel parameter "iomem=relaxed". Thus, if you boot manually you would enter e g "linux=vmlinuz.. iomem=relaxed".
-- 
2.39.2