Re: [PATCH 1/1] arm: boards: support native fdt for raspberry pi

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On Fri, Jun 08, 2018 at 07:41:33AM +0000, Pascal Vizeli wrote:
> It store the native device tree from bootloader to '/rpi_native.dtb'.
> This device tree is not compatible with barebox but needed to boot the
> linux kernel correctly. With new overlay support we can patch this
> device tree on runtime.
> 
> Now barebox can be the middle bootloader and we have no limitations to
> origin bootloader.
> 
> Question: How I can share a address between PBL and barebox?

See other mail I just sent you.

> +static int rpi_native_fdt(void)
> +{
> +	struct fdt_header *oftree;
> +	int mode = O_RWSIZE_4 | O_RDONLY;
> +	int fd = 0;
> +	uint32_t size;
> +	void *map;
> +
> +	fd = open_and_lseek("/dev/mem", mode, rpi_fdt_addr);
> +	if (fd < 0) {
> +		printf("failed open /dev/mem for fdt");
> +		goto end;
> +	}
> +
> +	map = memmap(fd, PROT_READ);
> +	if (map == (void *)-1) {
> +		printf("failed map memory for fdt");
> +		goto end;
> +	}

No need to open/memmap /dev/mem. Just dereference the memory location.

Sascha

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