u-boot/doc/README.nokia_rx51

3 This board definition results in a u-boot.bin which can be chainloaded
9 onenand as such. This u-boot is intended to be flashed to the N900 like
10 a kernel. In order to transparently boot the original kernel, it will be
11 appended to u-boot.bin at 0x40000. NOLO will load the entire image into
12 (random) memory and execute u-boot, which saves hw revision, boot reason
13 and boot mode ATAGs set by NOLO. Then the bootscripts will attempt to load
14 uImage or boot.scr from a fat, ext2/ext3 or ext4 filesystem in external
17 stored ATAGs (see boot order).
20 NOLO so u-boot must kick watchdog to prevent reboot device (but not very
25 When U-Boot is starting it enable IBE bit in Auxiliary Control Register,
28 Default boot order:
30  * 0. if keyboard is closed boot automatically attached kernel image
31  * 1. try boot from external SD card
32  * 2. try boot from internal eMMC memory
33  * 3. try boot from attached kernel image
35 Boot from SD or eMMC in this order:
38    * 1.1 find boot.scr on first fat partition
51  * run sdboot - Boot from external SD card (see boot order)
52  * run emmcboot - Boot from internal eMMC memory (see boot order)
53  * run attachboot - Boot attached kernel image (attached to U-Boot binary)
55  * run scriptload - Load boot script ${mmcscriptfile}
56  * run scriptboot - Run loaded boot script
59  * run kernboot - Boot loaded kernel image
60  * run kerninitrdboot - Boot loaded kernel image with loaded initrd image
62  * run trymmcscriptboot - Try to load and boot script ${mmcscriptfile}
63  * run trymmckernboot - Try to load and boot kernel image ${mmckernfile}
64  * run trymmckerninitrdboot - Try to load and boot kernel image ${mmckernfile}
77  * setup_boot_reason_atag - Change boot reason in OMAP table
78  * setup_boot_mode_atag - Change boot mode in OMAP table
82  Maemo kernel 2.6.28 will crash if u-boot enable usb tty. So USB TTY is disabled.
99  UBIFS support is disabled, because U-Boot image is too big and cannot be