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https://github.com/AsahiLinux/u-boot
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56 lines
2.2 KiB
Text
56 lines
2.2 KiB
Text
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U-Boot for the Gateworks Ventana Product Family boards
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This file contains information for the port of U-Boot to the Gateworks
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Ventana Product family boards.
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1. Boot source, boot from NAND
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------------------------------
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The i.MX6 BOOT ROM expects some structures that provide details of NAND layout
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and bad block information (referred to as 'bootstreams') which are replicated
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multiple times in NAND. The number of replications is configurable through
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board strapping options and eFUSE settings. The Freescale 'kobs-ng'
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application from the Freescale LTIB BSP, which runs under Linux, must be used
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to program the bootstream in order to setup the replicated headers correctly.
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The Gateworks Ventana boards with NAND flash have been factory programmed
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such that their eFUSE settings expect 2 copies of the boostream (this is
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specified by providing kobs-ng with the --search_exponent=1 argument). Once in
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Linux with MTD support for the NAND on /dev/mtd0 you can program the boostream
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with:
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kobs-ng init -v -x --search_exponent=1 u-boot.imx
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The kobs-ng application uses an imximage (u-boot.imx) which contains the
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Image Vector Table (IVT) and Device Configuration Data (DCD) structures that
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the i.MX6 BOOT ROM requires to boot. The kobs-ng adds the Firmware
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Configuration Block (FCB) and Discovered Bad Block Table (DBBT).
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This information is taken from:
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http://trac.gateworks.com/wiki/ventana/bootloader#NANDFLASH
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More details about the i.MX6 BOOT ROM can be found in the IMX6 reference manual.
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2. Build
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--------
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There are several Gateworks Ventana boards that share a simliar design but
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vary based on CPU, Memory configuration, and subloaded devices. Although
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the subloaded devices are handled dynamically in the bootloader using
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factory configured EEPROM data to modify the device-tree, the CPU choice
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(IMX6Q vs IMX6DL) and memory configurations are currently compile-time
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options.
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The following Gateworks Ventana configurations exist:
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gwventanaq1gspi: MX6Q,1GB,SPI FLASH
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gwventanaq : MX6Q,512MB,NAND FLASH
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gwventanaq1g : MX6Q,1GB,NAND FLASH
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gwventanadl : MX6DL,512MB,NAND FLASH
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gwventanadl1g : MX6DL,1GB,NAND FLASH
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To build U-Boot for the MX6Q,1GB,NAND FLASH for example:
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make gwventanaq1g_config
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make
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