configs/pc_x86_64_{bios, efi}_defconfig: new samples

Add two new sample defconfigs oriented towards real PC targets.

It adds two variants for BIOS and EFI boot strategy.

On the build side we enable eudev to autoload relevant kernel
modules/support when necessary.

It adds a bunch of drivers and extra filesystem support which is by no
means extensive/complete, mostly geared towards the hardware i've got at
hand to test with.
This is accomplished by adding on top of the Qemu x86_64 kernel sample
config.

Build connman since by using eudev network interfaces get renamed on
boot thus complicating any form of automatic and friendly bringup.
It also makes Wi-Fi configuration/support easier.

In principle these base defconfigs should work just fine for other
storage media != pendrive like sata or ssd disk, however driver support
isn't there quite yet, and pendrive is mostly supported by usb storage
plus the usual usb host controller drivers.

Tested on old Lenovo laptop (BIOS) and Asus Zenbook (EFI).

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

board/pc/genimage-bios.cfg

@@ -0,0 +1,24 @@
+image disk.img {
+
+  hdimage {
+  }
+
+  partition boot {
+    in-partition-table = "no"
+    image = "boot.img"
+    offset = 0
+    size = 512
+  }
+
+  partition grub {
+    in-partition-table = "no"
+    image = "grub.img"
+    offset = 512
+  }
+
+  partition root {
+    partition-type = 0x83
+    image = "rootfs.ext2"
+  }
+
+}

board/pc/genimage-efi.cfg

@@ -0,0 +1,31 @@
+image efi-part.vfat {
+  vfat {
+    file startup.nsh {
+      image = "efi-part/startup.nsh"
+    }
+    file EFI {
+      image = "efi-part/EFI"
+    }
+    file bzImage {
+      image = "bzImage"
+    }
+  }
+  size = 16M
+}
+
+image disk.img {
+
+  hdimage {
+  }
+
+  partition boot {
+    partition-type = 0xEF
+    image = "efi-part.vfat"
+  }
+
+  partition root {
+    partition-type = 0x83
+    image = "rootfs.ext2"
+  }
+
+}

board/pc/linux-extras.config

@@ -0,0 +1,42 @@
+# Filesystem support
+CONFIG_FUSE_FS=y
+CONFIG_SQUASHFS=y
+
+# Ethernet drivers
+CONFIG_ATL2=m
+CONFIG_ATL1=m
+CONFIG_ATL1E=m
+CONFIG_ATL1C=m
+CONFIG_ALX=m
+CONFIG_E100=m
+CONFIG_E1000=m
+CONFIG_E1000E=m
+CONFIG_IGB=m
+CONFIG_R8169=m
+
+# Video drivers
+CONFIG_DRM_I915=y
+CONFIG_FB_VESA=y
+
+# Wireless drivers
+CONFIG_CFG80211=m
+CONFIG_CFG80211_WEXT=y
+CONFIG_MAC80211=m
+CONFIG_ATH_CARDS=m
+CONFIG_ATH9K=m
+CONFIG_ATH9K_HTC=m
+CONFIG_CARL9170=m
+CONFIG_ATH10K=m
+CONFIG_ATH10K_PCI=m
+CONFIG_IWL4965=m
+CONFIG_IWL3945=m
+CONFIG_IWLWIFI=m
+CONFIG_RT2X00=m
+CONFIG_RT2800PCI=m
+CONFIG_RT73USB=m
+CONFIG_RT2800USB=m
+CONFIG_RT2800USB_RT3573=y
+CONFIG_RT2800USB_RT53XX=y
+CONFIG_RT2800USB_RT55XX=y
+# CONFIG_RTL_CARDS is not set
+CONFIG_RTL8XXXU=m

board/pc/post-image.sh

@@ -0,0 +1,35 @@
+#!/bin/sh
+
+# Detect boot strategy, EFI or BIOS
+if [ -f ${BINARIES_DIR}/efi-part/startup.nsh ]; then
+  BOOT_TYPE=efi
+  # grub.cfg needs customization for EFI since the root partition is
+  # number 2, and bzImage is in the EFI partition (1)
+  cat >${BINARIES_DIR}/efi-part/EFI/BOOT/grub.cfg <<__EOF__
+set default="0"
+set timeout="5"
+
+menuentry "Buildroot" {
+	linux /bzImage root=/dev/sda2 rootwait console=tty1
+}
+__EOF__
+else
+  BOOT_TYPE=bios
+  # Copy grub 1st stage to binaries, required for genimage
+  cp -f ${HOST_DIR}/usr/lib/grub/i386-pc/boot.img ${BINARIES_DIR}
+fi
+
+BOARD_DIR="$(dirname $0)"
+GENIMAGE_CFG="${BOARD_DIR}/genimage-${BOOT_TYPE}.cfg"
+GENIMAGE_TMP="${BUILD_DIR}/genimage.tmp"
+
+rm -rf "${GENIMAGE_TMP}"
+
+genimage                           \
+       --rootpath "${TARGET_DIR}"     \
+       --tmppath "${GENIMAGE_TMP}"    \
+       --inputpath "${BINARIES_DIR}"  \
+       --outputpath "${BINARIES_DIR}" \
+       --config "${GENIMAGE_CFG}"
+
+exit $?

board/pc/readme.txt

@@ -0,0 +1,37 @@
+Bare PC sample config
+=====================
+
+1. Build
+
+  First select the appropriate target you want.
+
+  For BIOS-based boot strategy:
+
+  $ make pc_x86_64_bios_defconfig
+
+  Or for EFI:
+
+  $ make pc_x86_64_efi_defconfig
+
+  Add any additional packages required and build:
+
+  $ make
+
+2. Write the pendrive
+
+  The build process will create a pendrive image called sdcard.img in
+  output/images.
+
+  Write the image to a pendrive:
+
+  $ dd if=output/images/sdcard.img of=/dev/sdc; sync
+
+  Once it's done insert it into the target PC and boot.
+
+  Remember that if said PC has another boot device you might need to
+  select this alternative for it to boot.
+
+  In the case of EFI boot you might need to disable Secure Boot from
+  the setup as well.
+
+3. Enjoy