[Hardware Hacking General] AdamOutler:
I was in the SBL and I decided to change the SWITCH_SEL variable from 65 to 6543 and I ended up with this log in UART mode.

Uncompressing Linux...........................................................................................................................................................................................................................
[ 0.000000] copy: bad source 0
[ 0.000000] mout_audss: bad source 0
[ 0.090115] KERNEL:kernel_sec_get_debug_level_from_boot=0x574f4c44
[ 0.094842] KERNEL:magic_number=0x0 DEBUG LEVEL low!!
[ 0.099861] (kernel_sec_set_upload_cause) : upload_cause set 0
[ 2.909872] Failed to request gpio touchkey_init:661
[ 2.913480] Failed to request gpio touchkey_init:663
[ 3.889568] init: [disk_config] initialize_mbr_flash for S1_EUR
[ 3.894141] init: [disk_config] [Disk Size (16005464064), (15630336k), sector_size 512 :: num_lba 31260672 ]
[ 3.903715] init: [disk_config] calc_pte_of_disk -> start 64 num lba 27328448 next : 27328512
[ 3.912264] init: [disk_config] calc_pte_of_disk -> start 27328512 num lba 3932160 next : 31260672
[ 3.921930] init: [disk_config] compare_partition -> num_part 0 , offset (446)(0x1be)
[ 3.930675] init: [disk_config] [ target -> Disk0 : 13992165376 (13664224k) 00:0c:00000040:01a0ffc0 ]
[ 3.938468] init: [disk_config] Match partition table entry ... skip(0)
[ 3.945064] init: [disk_config] compare_partition -> num_part 1 , offset (462)(0x1ce)
[ 3.952871] init: [disk_config] [ target -> Disk1 : 2013265920 (1966080k) 00:0c:01a10000:003c0000 ]
[ 3.961876] init: [disk_config] Match partition table entry ... skip(1)
[ 3.968483] init: [disk_config] compare_partition -> num_part 2 , offset (478)(0x1de)
[ 3.976273] init: [disk_config] [ target -> Disk2 : 0 (0k) 00:00:00000000:00000000 ]
[ 3.983984] init: [disk_config] Match partition table entry ... skip(2)
[ 3.990601] init: [disk_config] compare_partition -> num_part 3 , offset (494)(0x1ee)
[ 3.998392] init: [disk_config] [ target -> Disk3 : 0 (0k) 00:00:00000000:00000000 ]
[ 4.006109] init: [disk_config] Match partition table entry ... skip(3)
[ 4.012714] init: [disk_config] bNeedRoot : 0x00
[ 4.024245] init: cannot open '/initlogo.rle'
[ 5.270232] init: [disk_config] :::: /dev/block/mmcblk0p1 :::::
[ 5.276196] init: [disk_config] vfat_identify -> ok
[ 5.279637] init: [disk_config] :::: /dev/block/mmcblk0p2 :::::
[ 5.288269] init: [disk_config] rfs_identify -> ok[FSA9480]connectivity_switching_init = switch_sel : 0x198f
[ 6.595514] init: cannot find '/system/etc/install-recovery.sh', disabling 'flash_recovery'
sh: can't access tty; job control turned off
$ [ 6.671431] init: wifi.mac_addr: check_wifi_address()
[ 6.733126] init: wifi.mac_addr: .mac.info already exist!
[ 6.789689] init: Cannot open "/system/bin/.BT_26_0M.hcd": Unknown error: -1
[ 8.359214] smdkc110_power_off: PHONE OFF Success
[ 8.422442] smdkc110_power_off: TA or USB connected, rebooting...
[ 8.427079] KERNEL:magic_number=0 CLEAR_UPLOAD_MAGIC_NUMBER
[ 8.432630] KERNEL:magic_number=0 CLEAR_UPLOAD_MAGIC_NUMBER
[ 8.438175] (kernel_sec_hw_reset) Upload Magic Code is cleared for silet reset.
[ 8.445460] (kernel_sec_hw_reset) ARIES_BUILD_INFO: HWREV: 1 Date:Feb 1 2011 Time:11:37:36
[ 8.453791] (kernel_sec_hw_reset) The forced reset was called. The system will be reset�1

This is the stuff we don't usually see during the kernel booting. This is a stock AT&T phone complete with errors. ;)

I ended up with a SH terminal :D

Um.. this may be obvious to some, but can anyone tell me what will occur when I select "Erase All" from the SBL? Will that toast the IBL and PBL? I'd like to figure out a way to use the SBL to boot from mmc or SDCard. I'm sure it's possible and it would be a good test to make sure we have a bootable mmc card to start with.