[U-Boot] [PATCH V5 REPOST 2/7] ARM: rpi_b: use bcm2835 mbox driver to get memory size
Albert ARIBAUD
albert.u.boot at aribaud.net
Wed Mar 20 16:31:02 CET 2013
Hi Stephen,
On Tue, 15 Jan 2013 19:26:54 -0700, Stephen Warren
<swarren at wwwdotorg.org> wrote:
> The firmware running on the bcm2835 SoC's VideoCore CPU determines how
> much of the system RAM is available for use by the ARM CPU. Previously,
> U-Boot assumed that only 128MB was available, since this was the
> smallest value configured by any public firmware. However, we can now
> query the actual value at run-time from the firmware using the mbox
> property protocol.
>
> Signed-off-by: Stephen Warren <swarren at wwwdotorg.org>
> ---
> v5: No change; merged patch series.
> v4: No change; rebased.
> v3: No change.
> v2: Updated to use macros etc. added in v2 of mbox driver patch.
> ---
> board/raspberrypi/rpi_b/rpi_b.c | 21 ++++++++++++++++++++-
> 1 file changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/board/raspberrypi/rpi_b/rpi_b.c b/board/raspberrypi/rpi_b/rpi_b.c
> index 688b0aa..3c654a1 100644
> --- a/board/raspberrypi/rpi_b/rpi_b.c
> +++ b/board/raspberrypi/rpi_b/rpi_b.c
> @@ -15,13 +15,32 @@
> */
>
> #include <common.h>
> +#include <asm/arch/mbox.h>
> #include <asm/global_data.h>
>
> DECLARE_GLOBAL_DATA_PTR;
>
> +struct msg_get_arm_mem {
> + struct bcm2835_mbox_hdr hdr;
> + struct bcm2835_mbox_tag_get_arm_mem get_arm_mem;
> + u32 end_tag;
> +};
> +
> int dram_init(void)
> {
> - gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
> + ALLOC_ALIGN_BUFFER(struct msg_get_arm_mem, msg, 1, 16);
> + int ret;
> +
> + BCM2835_MBOX_INIT_HDR(msg);
> + BCM2835_MBOX_INIT_TAG(&msg->get_arm_mem, GET_ARM_MEMORY);
> +
> + ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
> + if (ret) {
> + printf("bcm2835: Could not query ARM memory size\n");
> + return -1;
> + }
> +
> + gd->ram_size = msg->get_arm_mem.body.resp.mem_size;
>
> return 0;
> }
Applied to u-boot-arm/master, thanks!
Amicalement,
--
Albert.
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