SuDu

A utility that allows to dump correctly all mtdX partitions from Google Sooner prototypes.

Prerequisites

Download a source code of SuDu first.

Host System

Ubuntu Linux (tested on Ubuntu with gcc 4.6.3)

Toolchain/Other

The device uses OABI (Old ABI) syscall convention (__NR_SYSCALL_BASE = 0x900000). Standard glibc-based toolchains will not work due to incompatibility with Linux 2.6.22. The dump tool must be compiled without any libc, using raw syscalls.

Required compiler:

arm-linux-gnueabi-gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3

Install on Ubuntu:

sudo apt install gcc-arm-linux-gnueabi binutils-arm-linux-gnueabi

Compilation process

Use the following command to compile this program:

arm-linux-gnueabi-gcc \
  -march=armv5te \
  -mtune=arm926ej-s \
  -msoft-float \
  -marm \
  -nostdlib \
  -nostartfiles \
  -static \
  -fno-builtin \
  -o sudu sudu.c

Notes

The device runs Linux 2.6.22-omap1 compiled with gcc 4.1.1. Modern glibc (2.15+) uses kernel_helpers that do not exist in this kernel version, causing illegal instruction or hang on startup even with static binaries. So solution is to compile without any libc (-nostdlib -nostartfiles) and use raw OABI syscalls directly.