SamsungSerial » History » Revision 8
Revision 7 (Denis 'GNUtoo' Carikli, 08/14/2011 01:17 PM) → Revision 8/33 (Paul Kocialkowski, 08/14/2011 02:16 PM)
== Introduction == This page contains information on how to work on a bootloader replacement. == Informations == * The [http://git.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary official u-boot source code] already has support for the S5PC110 SOC(system on a chip) that the Nexus S uses * The S5PC110 has a bootrom * The Nexus S has an usb port with an FSA9480 behind it === Partitioning informations === Here's a detailed output showing the partitioning of the NAND that you can obtain with {{{ heimdall print-pit }}} with the device in download mode (VOL+ and VOL- held at reboot): {{{ Entry Count: 16 Unknown 1: 0 Unknown 2: 0 Unknown 3: 0 Unknown 4: 0 Unknown 5: 0 Unknown 6: 0 Unknown 7: 0 Unknown 8: 0 --- Entry #0 --- Unused: No Partition Type: 0 (RFS) Partition Identifier: 0 Partition Flags: 0 (R) Unknown 1: 0 Partition Block Size: 256 Partition Block Count: 1 Unknown 2: 0 Unknown 3: 0 Partition Name: IPBL Filename: bootloader.img --- Entry #1 --- Unused: No Partition Type: 0 (RFS) Partition Identifier: 1 Partition Flags: 0 (R) Unknown 1: 0 Partition Block Size: 256 Partition Block Count: 7 Unknown 2: 0 Unknown 3: 0 Partition Name: SBL Filename: --- Entry #2 --- Unused: No Partition Type: 0 (RFS) Partition Identifier: 2 Partition Flags: 0 (R) Unknown 1: 0 Partition Block Size: 256 Partition Block Count: 7 Unknown 2: 0 Unknown 3: 0 Partition Name: SBL2 Filename: --- Entry #3 --- Unused: No Partition Type: 0 (RFS) Partition Identifier: 3 Partition Flags: 0 (R) Unknown 1: 0 Partition Block Size: 256 Partition Block Count: 4 Unknown 2: 0 Unknown 3: 0 Partition Name: PARAM Filename: --- Entry #4 --- Unused: No Partition Type: 0 (RFS) Partition Identifier: 4 Partition Flags: 0 (R) Unknown 1: 0 Partition Block Size: 256 Partition Block Count: 5 Unknown 2: 0 Unknown 3: 0 Partition Name: MISC Filename: --- Entry #5 --- Unused: No Partition Type: 0 (RFS) Partition Identifier: 5 Partition Flags: 0 (R) Unknown 1: 0 Partition Block Size: 256 Partition Block Count: 32 Unknown 2: 0 Unknown 3: 0 Partition Name: BOOT Filename: boot.img --- Entry #6 --- Unused: No Partition Type: 0 (RFS) Partition Identifier: 6 Partition Flags: 0 (R) Unknown 1: 0 Partition Block Size: 256 Partition Block Count: 32 Unknown 2: 0 Unknown 3: 0 Partition Name: RECOVERY Filename: recovery.img --- Entry #7 --- Unused: No Partition Type: 0 (RFS) Partition Identifier: 7 Partition Flags: 1 (R) Unknown 1: 0 Partition Block Size: 256 Partition Block Count: 1878 Unknown 2: 0 Unknown 3: 0 Partition Name: CACHE Filename: cache.img --- Entry #8 --- Unused: Yes Partition Type: 0 (RFS) Partition Identifier: 8 Partition Flags: 0 (R) Unknown 1: 0 Partition Block Size: 256 Partition Block Count: 54 Unknown 2: 0 Unknown 3: 0 Partition Name: RADIO Filename: radio.img --- Entry #9 --- Unused: No Partition Type: 0 (RFS) Partition Identifier: 9 Partition Flags: 1 (R) Unknown 1: 0 Partition Block Size: 256 Partition Block Count: 27 Unknown 2: 0 Unknown 3: 0 Partition Name: EFS Filename: --- Entry #10 --- Unused: No Partition Type: 0 (RFS) Partition Identifier: 10 Partition Flags: 0 (R) Unknown 1: 0 Partition Block Size: 256 Partition Block Count: 1 Unknown 2: 0 Unknown 3: 0 Partition Name: DGS Filename: dgs.img --- Entry #11 --- Unused: No Partition Type: 2 (EXT4) Partition Identifier: 0 Partition Flags: 2 (R/W) Unknown 1: 0 Partition Block Size: 512 Partition Block Count: 2048 Unknown 2: 0 Unknown 3: 0 Partition Name: PGPT Filename: emmc.img --- Entry #12 --- Unused: No Partition Type: 2 (EXT4) Partition Identifier: 1 Partition Flags: 2 (R/W) Unknown 1: 0 Partition Block Size: 512 Partition Block Count: 1048576 Unknown 2: 0 Unknown 3: 0 Partition Name: SYSTEM Filename: system.img --- Entry #13 --- Unused: No Partition Type: 2 (EXT4) Partition Identifier: 2 Partition Flags: 2 (R/W) Unknown 1: 0 Partition Block Size: 512 Partition Block Count: 2097152 Unknown 2: 0 Unknown 3: 0 Partition Name: USERDATA Filename: userdata.img --- Entry #14 --- Unused: No Partition Type: 2 (EXT4) Partition Identifier: 3 Partition Flags: 2 (R/W) Unknown 1: 0 Partition Block Size: 512 Partition Block Count: 33554432 Unknown 2: 0 Unknown 3: 0 Partition Name: MEDIA Filename: media.img --- Entry #15 --- Unused: No Partition Type: 2 (EXT4) Partition Identifier: 4 Partition Flags: 2 (R/W) Unknown 1: 0 Partition Block Size: 512 Partition Block Count: 33 Unknown 2: 0 Unknown 3: 0 Partition Name: SGPT Filename: }}} == TODO == * Look if [http://www.glassechidna.com.au/products/heimdall/ Heimdall] can talk to the bootrom * Serial console: * Use the correct resistors enabling the serial console on the FSA9480 * Mesure the voltage of the Nexus S serial port * Make a level shifter to shift the serial port levels * Cross compile microcom or picocom * get a serial console * Find the JTAG * look if the first stage bootloader(after the bootrom) is signed