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Roberto Gordo Saez
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Initial commit - smartQi bootloader
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‎.gitignore

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.*
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*.o
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*.a
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*.so
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!.gitignore
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*.orig
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*.rej
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image/*

‎Makefile

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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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# MA 02111-1307 USA
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#
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include config.mk
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BUILD_DATE := $(shell date -Iseconds)
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BUILD_HOST := $(shell hostname)
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BUILD_VERSION := 20091105-SmartQ
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LDS = src/cpu/$(CPU)/qi.lds
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INCLUDE = include
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IMAGE_DIR = image
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TOOLS = tools
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CFLAGS = -Wall -Werror -I $(INCLUDE) -c -Os -fno-strict-aliasing -mlong-calls \
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-fno-common -ffixed-r8 -msoft-float -fno-builtin -ffreestanding \
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-march=armv6 -mno-thumb-interwork -Wstrict-prototypes -fno-stack-protector \
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-DBUILD_HOST="${BUILD_HOST}" -DBUILD_VERSION="${BUILD_VERSION}" \
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-DBUILD_DATE="${BUILD_DATE}" -DQI_CPU="${CPU}" -DSMARTQ
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LDFLAGS =
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S_SRCS = $(wildcard src/cpu/$(CPU)/*.S)
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S_OBJS = $(patsubst %.S,%.o, $(S_SRCS))
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C_SRCS = $(wildcard src/*.c) \
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$(wildcard src/fs/*.c) \
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$(wildcard src/cpu/$(CPU)/*.c)
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C_OBJS = $(patsubst %.c,%.o, $(C_SRCS))
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SRCS = ${S_SRCS} ${C_SRCS}
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OBJS = ${S_OBJS} ${C_OBJS}
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LIBS = -L${COMPILER_LIB_PATH} -lgcc
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TARGET = $(IMAGE_DIR)/start_qi_all-$(CPU)
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IMAGE = $(IMAGE_DIR)/qi-$(CPU)-$(BUILD_VERSION)
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%.o: %.S
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@$(CC) $(CFLAGS) -o $@ $<
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%.o: %.c
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@$(CC) $(CFLAGS) -o $@ $<
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all:${IMAGE}
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${OBJS}:${SRCS} ${INCLUDE}/*.h
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${IMAGE}:${OBJS}
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@mkdir -p $(IMAGE_DIR)
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@$(LD) ${LDFLAGS} -T$(LDS) -g $(OBJS) -o ${TARGET} ${LIBS}
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@$(OBJCOPY) -O binary -S ${TARGET} ${IMAGE}
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@$(OBJDUMP) -d ${TARGET} > ${IMAGE}.dis
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clean:
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@rm -f *~ src/*.o src/*~
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@rm -f src/cpu/*/*.o src/cpu/*/*~
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@rm -f src/fs/*.o src/fs/*~
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@rm -f include/*~ ${IMAGE_DIR}/*

‎README

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SmartQ Qi
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=========
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This is a modified Qi bootloader for the SmartQ 5 MID. It can boot from the
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external SD card (keep the "move/fullscreen" button pressed and then press
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"power").
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Use make to compile. The resulting binary file will be placed on
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image/qi-s3c6410-<version>-SmartQ. Look at the script install-smartq-qi.sh
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in order to make a bootable SD card.
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-- Roberto Gordo Saez <[email protected]>
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Qi
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==
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Qi (named by Alan Cox on Openmoko kernel list) is a minimal bootloader that
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"breathes life" into Linux. Its goal is to stay close to the minimum needed
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to "load" and then "boot" Linux -- no boot menus, additional peripheral init
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or private states.
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What's wrong with U-Boot, they keep telling people to not reinvent the wheel?
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=============================================================================
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U-Boot is gradually becoming a simplified knockoff of Linux. After using it a
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while, it became clear we were cutting and pasting drivers into U-Boot from
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Linux, cutting them down and not having a plan to maintain the U-Boot versions
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as the Linux ones were changed.
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We decided that we would use full Linux for things that Linux is good at and
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only have the bootloader do the device init that is absolutely required before
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Linux can be pulled into memory and started. In practice since we had a working
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U-Boot implementation it meant cutting that right down to the bone (start.S
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mainly for s3c2442) and then building it up from scratch optimized to just do
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load and boot.
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Samsung - specific boot sequence
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================================
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Right now Qi supports Samsung "steppingstone" scheme devices, but in fact it's
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the same in processors like iMX31 that there is a small area of SRAM that is
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prepped with NAND content via ROM on the device. There's nothing that stops Qi
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use on processors without steppingstone, although the ATAG stuff assumes we deal
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with ARM based processor.
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Appending to commandline
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========================
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You can append to the Qi commandline by creating a file /boot/append-<device>,
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eg, /boot/append-GTA02 containing the additional kernel commandline you want.
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This means you can affect the boot per-rootfs, but that if you reimage the
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rootfs you at the same time define what is appeneded. Because these files are
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looked for with the <device> name in them, options can be selected depending on
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the device the rootfs is run on.
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Initrd support
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==============
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Initrd or initramfs in separate file is supported to be loaded at given
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memory address in addition to kernel image. The ATAGs are issued accordingly.

‎config.mk

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CPU=s3c6410
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CROSS_PATH=/usr/local/software/toolchain-arm-karmic.rgs0
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CROSS_COMPILE=${CROSS_PATH}/bin/arm-none-linux-gnueabi-
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COMPILER_LIB_PATH_PRE=${CROSS_PATH}/lib/gcc/arm-none-linux-gnueabi
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COMPILER_LIB_PATH=${COMPILER_LIB_PATH_PRE}/`ls ${COMPILER_LIB_PATH_PRE}`
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AS = $(CROSS_COMPILE)as
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LD = $(CROSS_COMPILE)ld
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CC = $(CROSS_COMPILE)gcc
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OBJCOPY = $(CROSS_COMPILE)objcopy
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OBJDUMP = $(CROSS_COMPILE)objdump
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HOSTCC = gcc
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export CROSS_COMPILE AD LD CC OBJCOPY OBJDUMP MKUDFU

‎include/ext2.h

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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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*
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* (C) Copyright 2003 Sysgo Real-Time Solutions, AG <www.elinos.com>
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* Pavel Bartusek <[email protected]>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* An implementation for the Ext2FS filesystem ported from GRUB.
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* Some parts of this code (mainly the structures and defines) are
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* from the original ext2 fs code, as found in the linux kernel.
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*/
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#define SECTOR_SIZE 0x200
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#define SECTOR_BITS 9
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/* Error codes */
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typedef enum
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{
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ERR_NONE = 0,
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ERR_BAD_FILENAME,
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ERR_BAD_FILETYPE,
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ERR_BAD_GZIP_DATA,
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ERR_BAD_GZIP_HEADER,
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ERR_BAD_PART_TABLE,
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ERR_BAD_VERSION,
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ERR_BELOW_1MB,
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ERR_BOOT_COMMAND,
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ERR_BOOT_FAILURE,
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ERR_BOOT_FEATURES,
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ERR_DEV_FORMAT,
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ERR_DEV_VALUES,
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ERR_EXEC_FORMAT,
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ERR_FILELENGTH,
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ERR_FILE_NOT_FOUND,
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ERR_FSYS_CORRUPT,
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ERR_FSYS_MOUNT,
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ERR_GEOM,
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ERR_NEED_LX_KERNEL,
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ERR_NEED_MB_KERNEL,
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ERR_NO_DISK,
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ERR_NO_PART,
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ERR_NUMBER_PARSING,
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ERR_OUTSIDE_PART,
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ERR_READ,
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ERR_SYMLINK_LOOP,
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ERR_UNRECOGNIZED,
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ERR_WONT_FIT,
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ERR_WRITE,
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ERR_BAD_ARGUMENT,
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ERR_UNALIGNED,
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ERR_PRIVILEGED,
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ERR_DEV_NEED_INIT,
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ERR_NO_DISK_SPACE,
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ERR_NUMBER_OVERFLOW,
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MAX_ERR_NUM
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} ext2fs_error_t;
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extern int ext2fs_ls(char *dirname);
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extern int ext2fs_open(const char *filename);
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extern int ext2fs_read(char *buf, unsigned len);
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extern int ext2fs_mount(void);
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extern int ext2fs_close(void);

‎include/i2c-bitbang.h

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/*
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* (C) Copyright 2007 OpenMoko, Inc.
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* Author: Andy Green <[email protected]>
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* Modified for SmartQ, 2009, Roberto Gordo Saez <[email protected]>
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*
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* Generic i2c bitbang state machine
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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/* controls symbol sequencing on i2c */
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enum i2c_bitbang_control {
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IBCONTROL_DO_START = -1,
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IBCONTROL_DO_STOP = -2,
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IBCONTROL_DO_READ = -3,
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IBCONTROL_COMPLETE = -4
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};
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/* control intra-bit and byte states */
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enum i2c_bitbang_states {
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IBS_INIT,
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IBS_START1,
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IBS_START2,
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IBS_ADS_TX_S,
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IBS_ADS_TX_H,
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IBS_ADS_TX_L,
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IBS_ADS_TX_ACK_H,
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IBS_ADS_TX_ACK_L,
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IBS_DATA_RX_S,
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IBS_DATA_RX_H,
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IBS_DATA_RX_L,
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IBS_DATA_RX_ACK_H,
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IBS_DATA_RX_ACK_L,
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IBS_STOP1,
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IBS_STOP2,
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IBS_STOP3,
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IBS_STOP4
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};
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/* context for bitbang GPIO pins and transaction */
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struct i2c_bitbang {
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enum i2c_bitbang_states state;
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int count;
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unsigned int data[8]; /* read result found here */
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int index;
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int index_read;
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char (*read_sda)(void);
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/* data = 0 = op low, 1 == inp */
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void (*set)(char clock, char data);
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/* delay > 1 half-bit time, used by i2c_complete_synchronously() */
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void (*spin)(void);
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void (*close)(void);
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};

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