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

[Pascal Vizeli <pvizeli@syshack.ch>]

That is a RFC, the command `--subject-prefix="RFC"` had not work...

2018-06-08 9:41 GMT+02:00 Pascal Vizeli <pvizeli@syshack.ch>:
> 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?
>
> Signed-off-by: Pascal Vizeli <pvizeli@syshack.ch>
> ---
>  arch/arm/boards/raspberry-pi/lowlevel.c   |  4 +++
>  arch/arm/boards/raspberry-pi/rpi-common.c | 40 +++++++++++++++++++++++
>  2 files changed, 44 insertions(+)
>
> diff --git a/arch/arm/boards/raspberry-pi/lowlevel.c b/arch/arm/boards/raspberry-pi/lowlevel.c
> index cbc6caa4b..07d6f1101 100644
> --- a/arch/arm/boards/raspberry-pi/lowlevel.c
> +++ b/arch/arm/boards/raspberry-pi/lowlevel.c
> @@ -4,10 +4,13 @@
>  #include <asm/barebox-arm-head.h>
>  #include <mach/platform.h>
>
> +extern uint32_t rpi_fdt_addr;
> +
>  extern char __dtb_bcm2835_rpi_start[];
>  ENTRY_FUNCTION(start_raspberry_pi1, r0, r1, r2)
>  {
>         void *fdt = __dtb_bcm2835_rpi_start + get_runtime_offset();
> +       rpi_fdt_addr = r2;
>
>         arm_cpu_lowlevel_init();
>
> @@ -18,6 +21,7 @@ extern char __dtb_bcm2836_rpi_2_start[];
>  ENTRY_FUNCTION(start_raspberry_pi2, r0, r1, r2)
>  {
>         void *fdt = __dtb_bcm2836_rpi_2_start + get_runtime_offset();
> +       rpi_fdt_addr = r2;
>
>         arm_cpu_lowlevel_init();
>
> diff --git a/arch/arm/boards/raspberry-pi/rpi-common.c b/arch/arm/boards/raspberry-pi/rpi-common.c
> index 6e375bc98..43326e55d 100644
> --- a/arch/arm/boards/raspberry-pi/rpi-common.c
> +++ b/arch/arm/boards/raspberry-pi/rpi-common.c
> @@ -16,11 +16,13 @@
>  #include <common.h>
>  #include <init.h>
>  #include <fs.h>
> +#include <of.h>
>  #include <linux/stat.h>
>  #include <linux/clk.h>
>  #include <linux/clkdev.h>
>  #include <envfs.h>
>  #include <malloc.h>
> +#include <libfile.h>
>  #include <gpio.h>
>  #include <net.h>
>  #include <led.h>
> @@ -321,12 +323,50 @@ static int rpi_env_init(void)
>         return 0;
>  }
>
> +uint32_t rpi_fdt_addr;
> +
> +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;
> +       }
> +
> +       oftree = map;
> +       size = be32_to_cpu(oftree->totalsize);
> +       if (!size) {
> +               printf("failed read fdt");
> +               goto end;
> +       }
> +
> +       if (!write_file("/rpi_native.dtb", map, size))
> +               printf("Failed to write rpi_native.dtb");
> +
> +end:
> +       close(fd);
> +       return 0;
> +}
> +
>  static int rpi_devices_init(void)
>  {
>         rpi_model_init();
>         bcm2835_register_fb();
>         armlinux_set_architecture(MACH_TYPE_BCM2708);
>         rpi_env_init();
> +       rpi_native_fdt();
>         return 0;
>  }
>  late_initcall(rpi_devices_init);
> --
> 2.17.1
>

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