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Diffstat (limited to 'doc/README.nokia_rx51')
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1 files changed, 0 insertions, 96 deletions
diff --git a/doc/README.nokia_rx51 b/doc/README.nokia_rx51 deleted file mode 100644 index 7f22ed4..0000000 --- a/doc/README.nokia_rx51 +++ /dev/null @@ -1,96 +0,0 @@ -Board: Nokia RX-51 aka N900 - -This board definition results in a u-boot.bin which can be chainloaded -from NOLO in qemu or on a real N900. It does very little hardware config -because NOLO has already configured the board. Only needed is enabling -internal eMMC memory via twl4030 regulator which is not enabled by NOLO. - -NOLO is expecting a kernel image and will treat any image it finds in -onenand as such. This u-boot is intended to be flashed to the N900 like -a kernel. In order to transparently boot the original kernel, it will be -appended to u-boot.bin at 0x40000. NOLO will load the entire image into -(random) memory and execute u-boot, which saves hw revision, boot reason -and boot mode ATAGs set by NOLO. Then the bootscripts will attempt to load -uImage, zImage or boot.scr from a fat or ext2/3/4 filesystem on external -SD card or internal eMMC memory. If this fails or keyboard is closed then -the appended kernel image will be booted using some generated and some -stored ATAGs (see boot order). - -For generating combined image of u-boot and kernel (either in uImage or zImage -format) there is a simple script called u-boot-gen-combined. It is available in -following repository: - - https://github.com/pali/u-boot-maemo - -There is support for hardware watchdog. Hardware watchdog is started by -NOLO so u-boot must kick watchdog to prevent reboot device (but not very -often, max every 2 seconds). There is also support for framebuffer display -output with ANSI escape codes and the N900 HW keyboard input. - -When U-Boot is starting it enable IBE bit in Auxiliary Control Register, -which is needed for Thumb-2 ISA support. It is workaround for errata 430973. - -Default boot order: - - * 0. if keyboard is closed boot automatically attached kernel image - * 1. try boot from external SD card - * 2. try boot from internal eMMC memory - * 3. try boot from attached kernel image - -Boot from SD or eMMC in this order: - - * 1. - * 1.1 find boot.scr on first fat partition - * 1.2 find uImage on first fat partition - * 1.3 find zImage on first fat partition - * 1.4 same order for 2. - 4. fat partition - * 2. same as 1. but for ext2/3 partition - * 3. same as 1. but for ext4 partition - - -Available additional commands/variables: - - * run sdboot - Boot from external SD card (see boot order) - * run emmcboot - Boot from internal eMMC memory (see boot order) - * run attachboot - Boot attached kernel image (attached to U-Boot binary) - - * run scriptload - Load boot script ${mmcscriptfile} - * run scriptboot - Run loaded boot script - * run kernload - Load kernel image ${mmckernfile} - * run initrdload - Load initrd image ${mmcinitrdfile} - * run kernboot - Boot loaded kernel image - * run kerninitrdboot - Boot loaded kernel image with loaded initrd image - - * run trymmcscriptboot - Try to load and boot script ${mmcscriptfile} - * run trymmckernboot - Try to load and boot kernel image ${mmckernfile} - * run trymmckerninitrdboot - Try to load and boot kernel image ${mmckernfile} - with initrd image ${mmcinitrdfile} - -Additional variables for loading files from mmc: - - * mmc ${mmcnum} (0 - external, 1 - internal) - * partition number ${mmcpart} (1 - 4) - * parition type ${mmctype} (fat, ext2, ext4) - -Additional variables for booting kernel: - - * setup_omap_atag - Add OMAP table into atags structure (needs maemo kernel) - * setup_console_atag - Enable serial console in OMAP table - * setup_boot_reason_atag - Change boot reason in OMAP table - * setup_boot_mode_atag - Change boot mode in OMAP table - - Variable setup_omap_atag is automatically set when booting attached kernel. - When variable setup_omap_atag is set, variable setup_console_atag is unset - and u-boot standard output is set to serial then setup_console_atag is - automatically set to 1. So output from Maemo kernel would go to serial port. - -UBIFS support: - - UBIFS support is disabled, because U-Boot image is too big and cannot be - flashed with attached zImage to RX-51 kernel nand area. For enabling UBIFS - support add following lines into file configs/nokia_rx51_defconfig - - CONFIG_CMD_UBI=y - CONFIG_CMD_UBIFS=y - CONFIG_MTD_UBI_FASTMAP=y - CONFIG_MTD_UBI_FASTMAP_AUTOCONVERT=1 |