From: Sascha Hauer <s.hauer@pengutronix.de>
To: Pascal Vizeli <pvizeli@syshack.ch>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 1/1] arm: boards: support native fdt for raspberry pi
Date: Mon, 11 Jun 2018 08:34:45 +0200 [thread overview]
Message-ID: <20180611063445.fwbw2m5ha6p2nhlj@pengutronix.de> (raw)
In-Reply-To: <20180608074133.30653-1-pvizeli@syshack.ch>
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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prev parent reply other threads:[~2018-06-11 6:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-08 7:41 Pascal Vizeli
2018-06-08 7:47 ` Pascal Vizeli
2018-06-11 6:34 ` Sascha Hauer [this message]
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