joshua stein jcs

I flashed a U-boot build to the Geniatech XPI-3128 that was not correct and the board no longer booted properly, but apparently booted enough that the RK3128 wouldn't automatically go into its maskrom mode. Powering it on while pressing the recovery button (next to the IR head) did nothing.

Maskrom mode can be forced by disabling the eMMC module so that U-boot will not load at all. This can be done by shorting the test point (yellow) on the top of the board, pointed to with the red arrow, to ground while powering up the board with a USB cable plugged into the bottom right-most USB port (when facing the USB ports). The heatsink and Wi-Fi module will need to be removed to be able to access this test point.

    Scope (_SB.PCI0.I2C1)
    {
        Device (TPL1)
        {
            Name (HID2, Zero)
            Name (SBFB, ResourceTemplate ()
            {
                I2cSerialBusV2 (0x004C, ControllerInitiated, 0x00061A80,
                    AddressingMode7Bit, "\\_SB.PCI0.I2C1",

Moved to https://jcs.org/notaweblog/2016/08/26/openbsd_chromebook/

####Disabling SPI write protection

Put the Chromebook in developer-mode:

With machine powered off, hold down Esc and Refresh(F3) while hitting power button
At warning prompt, hit Control+D, then Enter at prompt about enabling developer mode
Machine will format itself

Now remove the write-protect screw to enable flashrom to flash new Coreboot/Libreboot.

Flip powered-off machine over and remove 8 philips-head screws. 2 are located under rubber feet.

Keybase proof

I hereby claim:

I am jcs on github.
I am jcs (https://keybase.io/jcs) on keybase.
I have a public key whose fingerprint is 51DE 5E0C 5643 6F37 D718 0936 603C A7D7 27C9 E467

To claim this, I am signing this object:

Update (2019-05-06): The Broadcom wireless card in the MacBook Pro works and can be crammed into the Air.

Update (2015-12-04): This document used to be very lengthy as there were many manual steps required to get OpenBSD and Mac OS X working together through Boot Camp Assistant (BCA), which created a hybrid MBR and enabled a legacy BIOS emulation mode which older versions of Windows (and OpenBSD) required. Newer Macbooks stopped supporting older versions of Windows through BCA and now only support Windows 10 since it uses GPT and UEFI. However, now that newer versions of OpenBSD support GPT and UEFI, Boot Camp Assistant is no longer needed at all to boot OpenBSD.

macOS FileVault encryption and OpenBSD encrypted softraid on a Macbook Air/Pro

OpenBSD works pretty well on at least the Mid-2011 Macbook Air (A1370, SandyBridge) and Mid-2013 Macbook Air (Haswell). The new KMS code in 5.4 brings up the MBA's eDP display in 1366x768 with backlight

	uhidev5 at uhub6 port 4 configuration 1 interface 0 "LG Electronics Inc. USB Controls" rev 2.00/3.04 addr 7
	uhidev5: iclass 3/0
	uhid5 at uhidev5: input=64, output=64, feature=8
	uhidev6 at uhub6 port 4 configuration 1 interface 1 "LG Electronics Inc. USB Controls" rev 2.00/3.04 addr 7
	uhidev6: iclass 3/0
	uhid6 at uhidev6: input=4, output=0, feature=6
	uhidev7 at uhub6 port 4 configuration 1 interface 2 "LG Electronics Inc. USB Controls" rev 2.00/3.04 addr 7
	uhidev7: iclass 3/0
	uhid7 at uhidev7: input=6, output=0, feature=13

	# moving git commits from one tree to another, preserving original git commit metadata like date/time
	# (creating a new hash, of course)

	# find current commits
	git log jcs [email protected] --no-merges --oneline --no-abbrev-commit --reverse \| sed 's/ .*//' > commits

	# in new git tree, for each $hash in $commits
	git --git-dir=/path/to/old/tree/.git format-patch -k -1 --stdout <hash> \| git am -3 -k

	#
	# solution for resizing jpegs and pngs of arbitrary size down to a 72x72
	# square, preserving source ratio, and filling non-square sides with
	# transparency
	#
	# ahead of time, convert a transparent 72x72 png to blank-72.pam and save
	# it with your code
	#
	# pngtopam -quiet -alphapam < blank-72.png > blank-72.pam
	#