diff options
author | Stefan Agner <stefan.agner@toradex.com> | 2016-11-10 16:39:27 -0800 |
---|---|---|
committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2017-01-11 21:25:10 +0100 |
commit | c2b777467b92a73592441993f280f48fb99cde39 (patch) | |
tree | a8b38838244b173ae234613124982501cf19533d /board | |
parent | 863ab5b03106c80a4565b09f2fcc0628adea8747 (diff) |
board: colibri_imx7: reserve DDR memory for Cortex-M4
i.MX 7's Cortex-M4 core can run from DDR and uses DDR memory for
the rpmsg communication. Both use cases need a fixed location of
memory reserved. For the rpmsg use case the reserved area needs
to be in sync with the kernel's hardcoded vring descriptor location.
Use the linux,usable-memory property to carve out 1MB of memory
in case the M4 core is running. Also make sure that the i.MX 7
specific rpmsg driver does not get loaded in case we do not carve
out memory.
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Max Krummenacher <max.krummenacher@toradex.com>
Diffstat (limited to 'board')
-rw-r--r-- | board/toradex/colibri_imx7/colibri_imx7.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/board/toradex/colibri_imx7/colibri_imx7.c b/board/toradex/colibri_imx7/colibri_imx7.c index e1340c323b7..8ed85c780ac 100644 --- a/board/toradex/colibri_imx7/colibri_imx7.c +++ b/board/toradex/colibri_imx7/colibri_imx7.c @@ -16,6 +16,7 @@ #include <common.h> #include <dm.h> #include <dm/platform_data/serial_mxc.h> +#include <fdt_support.h> #include <fsl_esdhc.h> #include <linux/sizes.h> #include <mmc.h> @@ -391,6 +392,43 @@ int checkboard(void) #if defined(CONFIG_OF_LIBFDT) && defined(CONFIG_OF_BOARD_SETUP) int ft_board_setup(void *blob, bd_t *bd) { +#if defined(CONFIG_IMX_BOOTAUX) + int up; + + up = arch_auxiliary_core_check_up(0); + if (up) { + int ret; + int areas = 1; + u64 start[2], size[2]; + + /* + * Reserve 1MB of memory for M4 (1MiB is also the minimum + * alignment for Linux due to MMU section size restrictions). + */ + start[0] = gd->bd->bi_dram[0].start; + size[0] = SZ_256M - SZ_1M; + + /* If needed, create a second entry for memory beyond 256M */ + if (gd->bd->bi_dram[0].size > SZ_256M) { + start[1] = gd->bd->bi_dram[0].start + SZ_256M; + size[1] = gd->bd->bi_dram[0].size - SZ_256M; + areas = 2; + } + + ret = fdt_set_usable_memory(blob, start, size, areas); + if (ret) { + eprintf("Cannot set usable memory\n"); + return ret; + } + } else { + int off; + + off = fdt_node_offset_by_compatible(blob, -1, "fsl,imx7d-rpmsg"); + if (off > 0) + fdt_status_disabled(blob, off); + } +#endif + return ft_common_board_setup(blob, bd); } #endif |