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authorIgor Opaniuk <igor.opaniuk@toradex.com>2019-12-03 14:04:47 +0200
committerStefano Babic <sbabic@denx.de>2019-12-06 12:09:30 +0100
commitc671d8af0bb07b028d808b994b83b2ec25578a44 (patch)
tree6b167c1835d62577ce589ebe5096a6621a8778c2 /board
parent949b5a969d107613b61a1e5eaf9e43c75a97f42c (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> Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com> Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Diffstat (limited to 'board')
-rw-r--r--board/toradex/colibri_imx7/colibri_imx7.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/board/toradex/colibri_imx7/colibri_imx7.c b/board/toradex/colibri_imx7/colibri_imx7.c
index c001316591..b0914a9ead 100644
--- a/board/toradex/colibri_imx7/colibri_imx7.c
+++ b/board/toradex/colibri_imx7/colibri_imx7.c
@@ -333,6 +333,43 @@ 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) && defined(CONFIG_ARCH_FIXUP_FDT_MEMORY)
+ 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
#if defined(CONFIG_FDT_FIXUP_PARTITIONS)
static const struct node_info nodes[] = {
{ "fsl,imx7d-gpmi-nand", MTD_DEV_TYPE_NAND, }, /* NAND flash */