Hi Stephen, On Tue, 15 Jan 2013 19:26:54 -0700, Stephen Warren <[email protected]> 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 <[email protected]> > --- > 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. _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
