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@@ -9,10 +9,13 @@ Supported models
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* OLPC XO-1
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The original NS Geode based OLPC laptop, uses the x86 architecture.
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+ Can be booted either from an internal MTD device formatted with JFFS2
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+ or from a FAT or EXT4 partition on a SD card or a USB flash stick.
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* OLPC XO-7.5
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The ARM-based laptop. Needs a recent enough firmware to provide a good
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- enough flattened device tree to the kernel.
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+ enough flattened device tree to the kernel. Can be from a FAT or EXT4
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+ partition on a internal eMMC, a SD card or a USB flash stick.
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Configure and build
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===================
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@@ -59,20 +62,37 @@ to update the firmware:
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ok flash ext:\q4e00ja.rom \ Flash the "q4e00ja.rom" from the SD card
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ok flash u:\q4e00ja.rom \ Flash the "q4e00ja.rom" from USB stick
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-Create the bootable media
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-=========================
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+Create the bootable SD card or USB flash stick
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+==============================================
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-When the build is finished, the resulting image file will be called
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-"sdcard.img". It can be written directly to a SD-card or and USB flash stick.
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+When the build is finished, an image file called "sdcard.img" will be created.
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+It is suitable for writing directly to a SD card, USB flash stick or (on a
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+XO-1.75) the internal eMMC flash.
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-Please double check that you're using the right device (e.g. with "lsblk"
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-command). Doing the following will DESTROY ALL DATA that's currently on the
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-media.
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+Before writing the image, please double check that you're using the right
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+device (e.g. with "lsblk" command). Doing the following will DESTROY ALL DATA
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+that's currently on the media.
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# cat output/images/sdcard.img >/dev/<device>
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+Flashing the JFFS2 image (XO-1 only)
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+====================================
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+
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+Unlike XO-1.75, the internal NAND flash on XO-1 is accessed without a
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+FTL and needs a flash-friendly filesystem. A build configured for XO-1
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+creates a file named "root.jffs2" that can be written to it.
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+
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+One way to write it is from the Open Firmware prompt. First, partition
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+and format a USB flash disk with a FAT file system and place the
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+"root.jffs2" file onto it. Then power on the machine, enter the
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+Open Firmware port by pressing the ESC key and run the following:
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+
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+ ok patch noop ?open-crcs copy-nand \ Disable CRC check
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+ ok copy-nand u:\root.jffs2
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+
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Booting the machine
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===================
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Once your machine is unlocked, it will automatically boot from your media
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-wherever it will detect it attached to the USB bus or the SD card slot.
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+wherever it will detect it attached to the USB bus or the SD card slot,
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+otherwise it will proceed booting from the internal flash.
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