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In order to run on real hardware, it's actually easier to re-use
workflows from existing bootloaders than loading things in memory
manually. In order to achieve this two things had to be settled:
1. The image has to have a Linux header as defined in the RISC-V port.
This header will be taken into consideration by bootloaders in order to
know where to jump, the image offset, the endianness of the image, etc.
2. The image cannot just be an ELF executable. Rather, we must translate
it into binary form via `objcopy`.
With all of this at hand, I was able to make the kernel run on a
Starfive VisionFive 2 board, and I have recorded an example so it's
available as documentation.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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Bootstrap an init task which holds at least the initial stack that is to
be used when setting up the registers (such as `sp` and `tp`).
In order to guarantee that the stack and the rest of the registers are
set up correctly, this commit also provides a raw implementation of a
`printk` function.
Moreover, this commit also adds an argument that must be passed to
`start_kernel`, which is the pointer to the embedded `fdt` blob. This
argument will be used by later work so to fetch, at least, the base
address for the initial ram disk. This was also used to test that the
stack was working as expected.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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For now the base layout has been defined and we have a binary that is
properly reached through openSBI.
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
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