On Thu, Mar 09, 2017 at 04:28:25PM +0900, Masahiro Yamada wrote:
At first, the ARM64 Linux booting requirement recommended that the kernel image be placed text_offset bytes from 2MB aligned base near the start of usable system RAM because memory below that base address was unusable at that time.
This requirement was relaxed by Linux commit a7f8de168ace ("arm64: allow kernel Image to be loaded anywhere in physical memory"). Since then, the bit 3 of the flags field indicates the tolerance of the kernel physical placement. If this bit is set, the 2MB aligned base may be anywhere in physical memory. For details, see Documentation/arm64/booting.txt of Linux.
The booti command should be also relaxed. If the bit 3 is set, images->ep is respected, and the image is placed at the nearest bootable location. Otherwise, it is relocated to the start of the system RAM to keep the original behavior.
Another wrinkle we need to take care of is the unknown endianness of text_offset for a kernel older than commit a2c1d73b94ed (i.e. v3.16). We can detect this based on the image_size field. If the field is zero, just use a fixed offset 0x80000.
Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com
Applied to u-boot/master, thanks!