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diff --git a/board/sunxi/README.pine64 b/board/sunxi/README.pine64 deleted file mode 100644 index 5553415..0000000 --- a/board/sunxi/README.pine64 +++ /dev/null @@ -1,98 +0,0 @@ -Pine64 board README -==================== - -The Pine64(+) is a single board computer equipped with an AArch64 capable ARMv8 -compliant Allwinner A64 SoC. -This chip has ARM Cortex A-53 cores and thus can run both in AArch32 -(compatible to 32-bit ARMv7) and AArch64 modes. Upon reset the SoC starts -in AArch32 mode and executes 32-bit code from the Boot ROM (BROM). -This has some implications on U-Boot. - -Quick start -============ -- Get hold of a boot0.img file (see below for more details). -- Get the boot0img tool source from the tools directory in [1] and compile - that on your host. -- Build U-Boot: -$ export CROSS_COMPILE=aarch64-linux-gnu- -$ make pine64_plus_defconfig -$ make -- You also need a compiled ARM Trusted Firmware (ATF) binary. Checkout the - "allwinner" branch from the github repository [2] and build it: -$ export CROSS_COMPILE=aarch64-linux-gnu- -$ make PLAT=sun50iw1p1 DEBUG=1 bl31 - The resulting binary is build/sun50iw1p1/debug/bl31.bin. - -Now put an empty (or disposable) micro SD card in your card reader and learn -its device file name, replacing /dev/sd<x> below with the result (that could -be /dev/mmcblk<x> as well): - -$ ./boot0img --device /dev/sd<x> -e -u u-boot.bin -B boot0.img \ - -d trampoline64:0x44000 -s bl31.bin -a 0x44008 -p 100 -(either copying the respective files to the working directory or specifying -the paths directly) - -This will create a new partition table (with a 100 MB FAT boot partition), -copies boot0.img, ATF and U-Boot to the proper locations on the SD card and -will fill in the magic Allwinner header to be recognized by boot0. -Prefix the above call with "sudo" if you don't have write access to the -uSD card. You can also use "-o output.img" instead of "--device /dev/sd<x>" -to create an image file and "dd" that to the uSD card. -Omitting the "-p" option will skip the partition table. - -Now put this uSD card in the board and power it on. You should be greeted by -the U-Boot prompt. - - -Main U-Boot -============ -The main U-Boot proper is a real 64-bit ARMv8 port and runs entirely in the -64-bit AArch64 mode. It can load any AArch64 code, EFI applications or arm64 -Linux kernel images (often named "Image") using the booti command. -Launching 32-bit code and kernels is technically possible, though not without -drawbacks (or hacks to avoid them) and currently not implemented. - -SPL support -============ -The main task of the SPL support is to bring up the DRAM controller and make -DRAM actually accessible. At the moment there is no documentation or source -code available which would do this. -There are currently two ways to overcome this situation: using a tainted 32-bit -SPL (involving some hacks and resulting in a non-redistributable binary, thus -not described here) or using the Allwinner boot0 blob. - -boot0 method -------------- -boot0 is Allwiner's secondary program loader and it can be used as some kind -of SPL replacement to get U-Boot up and running. -The binary is a 32 KByte blob and contained on every Pine64 image distributed -so far. It can be easily extracted from a micro SD card or an image file: -# dd if=/dev/sd<x> of=boot0.bin bs=8k skip=1 count=4 -where /dev/sd<x> is the device name of the uSD card or the name of the image -file. Apparently Allwinner allows re-distribution of this proprietary code -as-is. -For the time being this boot0 blob is the only redistributable way of making -U-Boot work on the Pine64. Beside loading the various parts of the (original) -firmware it also switches the core into AArch64 mode. -The original boot0 code looks for U-Boot at a certain place on an uSD card -(at 19096 KB), also it expects a header with magic bytes and a checksum. -There is a tool called boot0img[1] which takes a boot0.bin image and a compiled -U-Boot binary (plus other binaries) and will populate that header accordingly. -To make space for the magic header, the pine64_plus_defconfig will make sure -there is sufficient space at the beginning of the U-Boot binary. -boot0img will also take care of putting the different binaries at the right -places on the uSD card and works around unused, but mandatory parts by using -trampoline code. See the output of "boot0img -h" for more information. -boot0img can also patch boot0 to avoid loading U-Boot from 19MB, instead -fetching it from just behind the boot0 binary (-B option). - -FEL boot -========= -FEL is the name of the Allwinner defined USB boot protocol built-in the -mask ROM of most Allwinner SoCs. It allows to bootstrap a board solely -by using the USB-OTG interface and a host port on another computer. -Since FEL boot does not work with boot0, it requires the libdram hack, which -is not described here. - -[1] https://github.com/apritzel/pine64/ -[2] https://github.com/apritzel/arm-trusted-firmware.git |