diff options
| -rw-r--r-- | arch/arm/mach-tegra/board2.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/board2.c b/arch/arm/mach-tegra/board2.c index ce9b695..e0d8687 100644 --- a/arch/arm/mach-tegra/board2.c +++ b/arch/arm/mach-tegra/board2.c @@ -274,3 +274,19 @@ void pad_init_mmc(struct mmc_host *host) #endif /* T30 */ } #endif /* MMC */ + +#ifdef CONFIG_ARM64 +/* + * Most hardware on 64-bit Tegra is still restricted to DMA to the lower + * 32-bits of the physical address space. Cap the maximum usable RAM area + * at 4 GiB to avoid DMA buffers from being allocated beyond the 32-bit + * boundary that most devices can address. + */ +ulong board_get_usable_ram_top(ulong total_size) +{ + if (gd->ram_top > 0x100000000) + return 0x100000000; + + return gd->ram_top; +} +#endif |