[LG Optimus 4X HD] arararagi:
Found this in another thread

I tried doing the same thing and just catting the resulting recovery image to boot.

It starts up and adb works, however only external SD on Tegra is accessible.

~ # find /dev/block/
/dev/block/
/dev/block/loop7
/dev/block/loop6
/dev/block/loop5
/dev/block/loop4
/dev/block/loop3
/dev/block/loop2
/dev/block/loop1
/dev/block/loop0
/dev/block/mmcblk0p1
/dev/block/platform
/dev/block/platform/sdhci-tegra.2
/dev/block/platform/sdhci-tegra.2/mmcblk0p1
/dev/block/platform/sdhci-tegra.2/by-num
/dev/block/platform/sdhci-tegra.2/by-num/p1
/dev/block/platform/sdhci-tegra.2/mmcblk0
/dev/block/mmcblk0
~ # cat /proc/partitions
major minor #blocks name

179 0 15351296 mmcblk0
179 1 15347200 mmcblk0p1

From dmesg:

<6>[ 3.855253] sdhci: Secure Digital Host Controller Interface driver
<6>[ 3.855433] sdhci: Copyright(c) Pierre Ossman
<4>[ 3.856721] mmc0: Invalid maximum block size, assuming 512 bytes
<6>[ 3.856848] mmc0: no vmmc regulator found
<7>[ 3.858202] Registered led device: mmc0::
<6>[ 3.861711] mmc0: SDHCI controller on platform [sdhci-tegra.3] using ADMA
<4>[ 3.863024] mmc1: Invalid maximum block size, assuming 512 bytes
<6>[ 3.863145] mmc1: no vmmc regulator found
<7>[ 3.864473] Registered led device: mmc1::
<6>[ 3.866846] mmc1: SDHCI controller on platform [sdhci-tegra.0] using ADMA
<4>[ 3.867178] tegra_gpio_irq_set_wake() called
<3>[ 3.867284] sdhci sdhci-tegra.2: SD card wake-up event registrationfailed with eroor: -22
<4>[ 3.868587] mmc2: Invalid maximum block size, assuming 512 bytes
<6>[ 3.868706] mmc2: no vmmc regulator found
<7>[ 3.870035] Registered led device: mmc2::
<6>[ 3.872372] mmc2: SDHCI controller on platform [sdhci-tegra.2] using ADMA
<7>[ 3.872860] Registered led device: button-backlight
<4>[ 3.872961] keypad_led_probe success
<6>[ 3.874563] tegra-se tegra-se: tegra_se_probe: complete
<6>[ 3.875491] usbcore: registered new interface driver usbhid
<6>[ 3.875681] usbhid: USB HID core driver
<6>[ 3.876370] logger: created 256K log 'log_main'
<6>[ 3.876608] logger: created 256K log 'log_events'
<6>[ 3.876939] logger: created 256K log 'log_radio'
<6>[ 3.877259] logger: created 256K log 'log_system'
<4>[ 3.972419] mmc0: switch to bus width 1 ddr 0 failed
<3>[ 3.972635] mmc0: error -110 whilst initialising MMC card
<4>[ 4.085800] mmc0: switch to bus width 1 ddr 0 failed
<3>[ 4.086013] mmc0: error -110 whilst initialising MMC card
<4>[ 4.213528] mmc0: switch to bus width 1 ddr 0 failed
<3>[ 4.213657] mmc0: error -110 whilst initialising MMC card
<4>[ 4.379808] mmc0: switch to bus width 1 ddr 0 failed
<3>[ 4.379939] mmc0: error -110 whilst initialising MMC card

This is how things should look (from the new kernel):

~ # find /dev/block/
/dev/block/
/dev/block/loop7
/dev/block/loop6
/dev/block/loop5
/dev/block/loop4
/dev/block/loop3
/dev/block/loop2
/dev/block/loop1
/dev/block/loop0
/dev/block/mmcblk1p1
/dev/block/mmcblk1
/dev/block/mmcblk0boot0
/dev/block/mmcblk0boot1
/dev/block/mmcblk0p13
/dev/block/mmcblk0p12
/dev/block/mmcblk0p11
/dev/block/mmcblk0p10
/dev/block/mmcblk0p9
/dev/block/mmcblk0p8
/dev/block/mmcblk0p7
/dev/block/mmcblk0p6
/dev/block/mmcblk0p5
/dev/block/mmcblk0p4
/dev/block/mmcblk0p3
/dev/block/mmcblk0p2
/dev/block/mmcblk0p1
/dev/block/platform
/dev/block/platform/sdhci-tegra.2
/dev/block/platform/sdhci-tegra.2/mmcblk1p1
/dev/block/platform/sdhci-tegra.2/by-num
/dev/block/platform/sdhci-tegra.2/by-num/p1
/dev/block/platform/sdhci-tegra.2/mmcblk1
/dev/block/platform/sdhci-tegra.3
/dev/block/platform/sdhci-tegra.3/mmcblk0boot0
/dev/block/platform/sdhci-tegra.3/mmcblk0boot1
/dev/block/platform/sdhci-tegra.3/mmcblk0p13
/dev/block/platform/sdhci-tegra.3/mmcblk0p12
/dev/block/platform/sdhci-tegra.3/mmcblk0p11
/dev/block/platform/sdhci-tegra.3/mmcblk0p10
/dev/block/platform/sdhci-tegra.3/mmcblk0p9
/dev/block/platform/sdhci-tegra.3/mmcblk0p8
/dev/block/platform/sdhci-tegra.3/mmcblk0p7
/dev/block/platform/sdhci-tegra.3/mmcblk0p6
/dev/block/platform/sdhci-tegra.3/mmcblk0p5
/dev/block/platform/sdhci-tegra.3/mmcblk0p4
/dev/block/platform/sdhci-tegra.3/mmcblk0p3
/dev/block/platform/sdhci-tegra.3/mmcblk0p2
/dev/block/platform/sdhci-tegra.3/mmcblk0p1
/dev/block/platform/sdhci-tegra.3/by-num
/dev/block/platform/sdhci-tegra.3/by-num/p13
/dev/block/platform/sdhci-tegra.3/by-num/p12
/dev/block/platform/sdhci-tegra.3/by-num/p11
/dev/block/platform/sdhci-tegra.3/by-num/p10
/dev/block/platform/sdhci-tegra.3/by-num/p9
/dev/block/platform/sdhci-tegra.3/by-num/p8
/dev/block/platform/sdhci-tegra.3/by-num/p7
/dev/block/platform/sdhci-tegra.3/by-num/p6
/dev/block/platform/sdhci-tegra.3/by-num/p5
/dev/block/platform/sdhci-tegra.3/by-num/p4
/dev/block/platform/sdhci-tegra.3/by-num/p3
/dev/block/platform/sdhci-tegra.3/by-num/p2
/dev/block/platform/sdhci-tegra.3/by-num/p1
/dev/block/platform/sdhci-tegra.3/by-name
/dev/block/platform/sdhci-tegra.3/by-name/UDB
/dev/block/platform/sdhci-tegra.3/by-name/CAL
/dev/block/platform/sdhci-tegra.3/by-name/FOT
/dev/block/platform/sdhci-tegra.3/by-name/MLT
/dev/block/platform/sdhci-tegra.3/by-name/DRM
/dev/block/platform/sdhci-tegra.3/by-name/UDA
/dev/block/platform/sdhci-tegra.3/by-name/NVA
/dev/block/platform/sdhci-tegra.3/by-name/USP
/dev/block/platform/sdhci-tegra.3/by-name/MSC
/dev/block/platform/sdhci-tegra.3/by-name/CAC
/dev/block/platform/sdhci-tegra.3/by-name/APP
/dev/block/platform/sdhci-tegra.3/by-name/LNX
/dev/block/platform/sdhci-tegra.3/by-name/SOS
/dev/block/platform/sdhci-tegra.3/mmcblk0
/dev/block/mmcblk0
~ # cat /proc/partitions
major minor #blocks name

179 0 15267840 mmcblk0
179 1 10240 mmcblk0p1
179 2 10240 mmcblk0p2
179 3 1572864 mmcblk0p3
179 4 393216 mmcblk0p4
179 5 2048 mmcblk0p5
179 6 81920 mmcblk0p6
179 7 2048 mmcblk0p7
179 8 13062144 mmcblk0p8
179 9 16384 mmcblk0p9
179 10 16384 mmcblk0p10
179 11 20480 mmcblk0p11
179 12 16384 mmcblk0p12
179 13 47104 mmcblk0p13
179 32 2048 mmcblk0boot1
179 16 2048 mmcblk0boot0
179 48 15351296 mmcblk1
179 49 15347200 mmcblk1p1

And dmesg:

<6>[70:01:01 00:00:08.609] sdhci: Secure Digital Host Controller Interface driver
<6>[70:01:01 00:00:08.609] sdhci: Copyright(c) Pierre Ossman
<6>[70:01:01 00:00:08.609] sdhci-pltfm: SDHCI platform and OF driver helper
<4>[70:01:01 00:00:08.609] mmc0: Invalid maximum block size, assuming 512 bytes
<6>[70:01:01 00:00:08.609] mmc0: no vmmc regulator found
<7>[70:01:01 00:00:08.609] Registered led device: mmc0::
<6>[70:01:01 00:00:08.609] mmc0: SDHCI controller on sdhci-tegra.3 [sdhci-tegra.3] using ADMA
<6>[70:01:01 00:00:08.609] sdhci-tegra sdhci-tegra.0: vddio_sd_slot regulator not found: -19. Assuming vddio_sd_slot is not required.
<6>[70:01:01 00:00:08.609] sdhci-tegra sdhci-tegra.0: Error: tegra3 io dpd not supported for sdhci-tegra.0
<4>[70:01:01 00:00:08.609] mmc1: Invalid maximum block size, assuming 512 bytes
<6>[70:01:01 00:00:08.609] mmc1: no vmmc regulator found
<7>[70:01:01 00:00:08.609] Registered led device: mmc1::
<6>[70:01:01 00:00:08.619] mmc1: SDHCI controller on sdhci-tegra.0 [sdhci-tegra.0] using ADMA
<3>[70:01:01 00:00:08.619] Failed gpio lp0 enable for irq=405, error=-22
<3>[70:01:01 00:00:08.619] sdhci-tegra sdhci-tegra.2: SD card wake-up event registrationfailed with eroor: -22
<6>[70:01:01 00:00:08.619] sdhci-tegra sdhci-tegra.2: vddio_sd_slot regulator not found: -19. Assuming vddio_sd_slot is not required.
<4>[70:01:01 00:00:08.619] mmc2: Invalid maximum block size, assuming 512 bytes
<6>[70:01:01 00:00:08.619] mmc2: no vmmc regulator found
<7>[70:01:01 00:00:08.619] Registered led device: mmc2::
<6>[70:01:01 00:00:08.619] mmc2: SDHCI controller on sdhci-tegra.2 [sdhci-tegra.2] using ADMA