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https://github.com/AsahiLinux/u-boot
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be893a5c09
LD20 / PXs3 boards are equipped with a large amount of memory beyond the 32 bit address range. U-Boot relocates itself to the end of the available RAM. This is a problem for DMA engines that only support 32 bit physical address, like the SDMA of SDHCI controllers. In fact, U-Boot does not need to run at the very end of RAM. It is rather troublesome for drivers with DMA engines because U-Boot does not have API like dma_set_mask(), so DMA silently fails, making the driver debugging difficult. Hide the memory region that exceeds the 32 bit address range. It can be done by simply carving out gd->ram_size. It would also possible to override get_effective_memsize() or to define CONFIG_MAX_MEM_MAPPED, but dram_init() is a good enough place to do this job. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> |
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| .. | ||
| cpu | ||
| dts | ||
| include | ||
| lib | ||
| mach-aspeed | ||
| mach-at91 | ||
| mach-bcm283x | ||
| mach-davinci | ||
| mach-exynos | ||
| mach-highbank | ||
| mach-imx | ||
| mach-integrator | ||
| mach-keystone | ||
| mach-kirkwood | ||
| mach-meson | ||
| mach-mvebu | ||
| mach-omap2 | ||
| mach-orion5x | ||
| mach-qemu | ||
| mach-rmobile | ||
| mach-rockchip | ||
| mach-s5pc1xx | ||
| mach-snapdragon | ||
| mach-socfpga | ||
| mach-sti | ||
| mach-stm32 | ||
| mach-sunxi | ||
| mach-tegra | ||
| mach-uniphier | ||
| mach-versatile | ||
| mach-zynq | ||
| thumb1/include/asm/proc-armv | ||
| config.mk | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||