Category: gentoo

One reason of

Reason: Failed on SHA256 verification

is that during creation of ebuilds some packages are fetched from external sources (for instance from adobe-flash site) and they sometimes publish new version of a package exactly under the same name.
Then next update results in a checksum error, because saved source from distfile directory is used.

To fix that you could:

rm -rf /usr/portage/www-plugins/adobe-flash/

or

fix it with
ebuild /usr/portage/www-plugins/adobe-flash/adobe-flash-11.2.202.411.ebuild clean prepare

Above situation should occure very rarely.

1. First make sure you have these options compiled into kernel

CONFIG_ATH_COMMON=m
CONFIG_ATH9K_HW=m
CONFIG_ATH9K_COMMON=m
CONFIG_ATH9K_HTC=m

If you cannot find them within your config it means that some other dependencies are missing from your kernel.
You can find it more easily with “make xconfig” and selecting option “show all”
2. Most likely you will have to select:

CONFIG_CFG80211
CONFIG_CFG80211_WEXT

Without these two you will receive a lot of fancy errors like:

ioctl[SIOCSIWPMKSA]: Invalid argument

3. If you will see warning related to RFKILL you can fix them by compiling RFKILL into your kernel and emerge rfkill as well.

CONFIG_RFKILL=y
CONFIG_RFKILL_LEDS=y
CONFIG_RFKILL_INPUT=y
CONFIG_ATH9K_RFKILL=y

After that you can check status of your device by:

rfkill list all

and if it’s blocked just unblock it by

rfkill unblock wifi

Ok.. now iwconfig should show some info about your device.
The only thing left is to confiugre /etc/wpa_supplicant/wpa_supplicant.conf file

for most common WPA2 configuration it should contain :

network={
ssid="yourSSID"
proto=WPA2
key_mgmt=WPA-PSK
pairwise=CCMP TKIP
group=CCMP TKIP WEP104 WEP40
priority=2
psk="yourpassword"
}

If you want to avoid having password in plaintext you can use command
wpa_passphrase yourSsid password

and then paste
psk=yourGeneratedHash

(note missing quotes!)

Now is time to check your configuration:

wpa_supplicant -iwlan0 -dd -Dwext -c/etc/wpa_supplicant/wpa_supplicant.conf

If everything works do

ln -s /etc/init.d/net.lo /etc/init.d/net.wlan0

and add it to default runlevel

rc-update add  net.wlan0 boot

In case of problems check:

1. Is your card visible by lsusb ?
2. Do you have any errors in dmesg
3. Did you rebooted after recompiling modles?

I didn’t have to download anything drivers from suspicious pages! So please do not do this!
Everything worked on a modern kernel 3.13.7

Other common samples of wpa_supplicant.conf configurations related to different router’s security settings can be found here:
http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?style=printable&part=4&chap=4#doc_chap2

Recently I was updating my comp of course there was a need to make some kernel changes (I switched to Intel i5-4570 ), but most of things went rather smoothly, but I had problems with time during dual boot.

hwclock: Open of /dev/rtc failed: No such file or directory
No usable clock interface found.
hwclock: Cannot access the Hardware Clock via any known method.

Checking kernel settings wasn’t obvious to me, cause dual boot was working previously and I though I moved previous kernel config..

Anyway RTC support was not included in kernel.. now I have:

CONFIG_HPET_EMULATE_RTC=y
CONFIG_RTC_LIB=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_HCTOSYS=y
CONFIG_RTC_SYSTOHC=y
CONFIG_RTC_HCTOSYS_DEVICE=”rtc0″
# RTC interfaces
CONFIG_RTC_INTF_SYSFS=y
CONFIG_RTC_INTF_PROC=y
CONFIG_RTC_INTF_DEV=y
# I2C RTC drivers
# SPI RTC drivers
# Platform RTC drivers
CONFIG_RTC_DRV_CMOS=y
# on-CPU RTC drivers
# HID Sensor RTC drivers

Some of settings may be not needed for you, but that’s my conf.
After recompiling and installing kernel error is gone.