jonte

><fs>  cryptsetup_open /dev/sda encrypted readonly:false crypttype:luks cipher:aes-cbc-plain                                                
Enter key or passphrase ("key"): 
guestfsd: => cryptsetup_open (0x1fc) took 0.02 secs
guestfsd: <= cryptsetup_open (0x1fc) request length 104 bytes
commandrvf: stdout=n stderr=y flags=0x0
commandrvf: udevadm --debug settle -E /dev/sda
SELinux enabled state cached to: disabled
No filesystem is currently mounted on /sys/fs/cgroup.
Failed to determine unit we run in, ignoring: No data available

jonte

This will configure QEMU to expose a tmp105 temperature sensor on the i2c-0 bus on x86_64. The temterature sensor can have its temperature set from the host OS, and the temperature can be read from the Linux client OS using the lm75 kernel module.

Building QEMU

For convenience, we will be emulating an x86 system. The x86 configuations which QEMU ships with do not contain the tmp105 sensor we will be using, so first we need to enable it.

Assuming you have the qemu sources in the qemu directory:

# cd qemu

echo "CONFIG_TMP105=y" >> default-configs/i386-softmmu.mak

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        GVariant *v = g_variant_dict_end(priv->prop_changed_dict);
        GVariantBuilder *vb = g_variant_builder_new(g_variant_type_new("(sa{sv}as)"));
        g_variant_builder_add(vb, "s", "Hello world");
        g_variant_builder_add(vb, "a{sv}", v);
        g_variant_builder_add(vb, "s", NULL);

jonte

What's this?

This is a conversion of the shopping lists available in the book (http://www.makershed.com/products/make-electronics-book), but with part numbers referring to the ELFA catalogue (https://www.elfa.se).

Experiments 1 through 5

Description	Qty	Category	ELFA #	Note
Small pliers	1	Tools	80-470-06
Side cutter	1	Tools	80-427-56
Multimeter	1	Tools	10-255-14
Alligator clamps	1	Tools	10-358-29

jonte

Core problem:
Fn buttons are controlled via ACPI. ACPI is configured via a board specific firmware called the DSDT. The DSDT sections for backlight broken for UX301LAA, so it needs fixing. I have attached my DSDT file which work on my machine (I have not tested it extensively, but backlight works at least).

#1 Dump the current DSDT to a file:
cat /sys/firmware/acpi/tables/DSDT > dsdt

#2 The DSDT is compiled, so we need to decompile it
iadsl -d dsdt

#3 Often, the file is not properly decompiled, so re-compile it in order to discover any de-compilation errors. Fix any errors (the code is probably unparsable if there are errors, so you need to guess the correct semantics).

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import struct
import sys

def getBytes(fs, pos, numBytes):
  fs.seek(pos)
  byte = fs.read(numBytes)
  if (numBytes == 2):
    formatString = "H"
  elif (numBytes == 1):
    formatString = "B"

jonte

; The error:
; llvm-as: core012.ll:84:1: error: instruction expected to be numbered '%4'
; %3 = getelementptr [6 x i8]* @.const1, i32 0, i64 0
; ^



define void @printBool(i1 %par.b) {
entry:

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#include <stdio.h>
#include <stdlib.h>
int main(){
    FILE *fpipe;
    char *command="echo \"2+2.\" | erl_call -sname ggs -e";
    char line[256];

    if ( !(fpipe = (FILE*)popen(command,"r")) ){
        perror("Problems with the pipe");
        exit(1);

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-module(v8test).
-export([run/0]).
-include_lib("erlv8/include/erlv8.hrl").

run() ->
    application:start(erlv8),
    {ok, VM} = erlv8_vm:start(),
    Global = erlv8_vm:global(VM),
    Global:set_value("callback",  erlv8_object:new([{"exec", fun (#erlv8_fun_invocation{}, []) -> myCallback() end}])),
    erlv8_vm:run(VM,"callback.exec();").

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-module(js_runner).
-export([executeJS/2, boot/0]).

boot() ->
    erlang_js:start(),
    {ok, Port} = js_driver:new(),
    Port.

executeJS(Port, Data) ->
    ok = js:define(Port, <<"function helloworld(name){return 'Hello, ' + name}">>),