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How to install Fedora on TrimSlice PRO
The TrimSlice PRO developer kit comes delivered with a 32GB SSD containing another Linux distribution, but can boot from pretty much any media (SD. USB, MicroSD, SSD) and you are free to experiment without voiding warranty.
U-Boot is factory preprogrammed in internal flash. There is no need to reflash U-Boot as the default U-Boot version is very open and friendly configured. But you may do so if you wish, following instructions from TrimSlice. One very nice thing is that the device allows easy recovery using the SD slot if the boot flash gets corrupted, eleminating the need for JTAG in such cases.
Kernel & Initrd
The kernel & initrd needs to be converted to U-Boot images. This is done by running
mkimage -A arm -O linux -T kernel -C none -a 0x00008000 -e 0x00008000 -n 2.6.40.3-0.fc15.armv7hl -d ../boot/vmlinuz-2.6.40.3-0.fc15.armv7hl.tegra uImage
mkimage -A arm -O linux -T ramdisk -C none -n 2.6.40.3-0.fc15.armv7hl -d ../boot/initramfs-2.6.40.3-0.fc15.armv7hl.tegra.img uInitrd
U-Boot behavior
The TrimSlice U-Boot automatically tries to boot from the first partition of any of the above boot sources and expects a boot.scr u-boot script file in / or /boot on the boot device.
When starting boot.scr the following variables are set for convenience
fs filesystem type (ext2 or fat) interface u-boot interface type (mmc or usb) bus bus number of the interface prefix boot prefix (/ or /boot)
enabling a generic boot.scr script to be used to boot from any of the possible boot devices. (see below)
Fedora boot script
Save this as boot.cmd in /boot and convert it to a uboot image by using
mkimage -A arm -O linux -T script -C none -d boot.cmd boot.scr
echo starting Fedora boot.scr
if test -z "${rootpart}" && test -z "${rootuuid}"; then
rootpart=4
#rootuuid=3e6be9de-8139-11d1-9106-a43f08d823a6
fi
#if test -z "${kernel}" && test -z "${kernelver}"; then
# kernelver=2.6.40.3-0.fc15.armv7hl.tegra
#fi
if test -z "${kernel}"; then
kernel=uImage
initrd=uInitrd
if test -n "${kernelver}"; then
kernel=${kernel}-${kernelver}
initrd=${kernel}-${kernelver}
fi
fi
if test -z "${console}"; then
console="console=ttyS0,115200n8"
fi
setenv initrdaddr 1600000
if test -n "${rootuuid}"; then
echo booting with UUID selected root
rootfs="ro root=UUID=${rootuuid}"
elif test "${interface}" = "mmc" && test "${bus}" = "1"; then
echo booting from internal microSD
echo booting from internal microSD
rootfs="ro root=/dev/mmcblk0p${rootpart}"
elif test "${interface}" = "mmc" && test "${bus}" = "0"; then
echo booting from external SD
if mmc init 1; then
rootfs="ro root=/dev/mmcblk1p${rootpart}"
else
rootfs="ro root=/dev/mmcblk0p${rootpart}"
fi
mmc init 0
elif test "${interface}" = "usb" && test "${bus}" = "1"; then
echo booting from internal SSD
rootfs="ro root=/dev/sda${rootpart} nohdparm rootwait"
else
echo booting from external USB
rootfs="ro root=/dev/sdb${rootpart} rootwait"
fi
setenv bootargs ${console} ${rootfs}
echo bootargs ${bootargs}
echo kernel ${fs}load ${interface} ${device} ${loadaddr} ${prefix}uImage${kernelver}
echo initrd ${fs}load ${interface} ${device} ${loadaddr} ${prefix}uImage${kernelver}
${fs}load ${interface} ${device} ${loadaddr} ${prefix}uImage${kernelver}
${fs}load ${interface} ${device} ${initrdaddr} ${prefix}uInitrd${kernelver}
bootm ${loadaddr} ${initrdaddr}