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authorStephen Warren <swarren@nvidia.com>2016-07-18 17:01:51 -0600
committerTom Warren <twarren@nvidia.com>2016-07-21 09:31:30 -0700
commit2a5f7f20747637cd1f94d4accfd7caa99a7c6035 (patch)
tree713bbf545a37930b51b731d925dfe60df74f1a82 /arch/arm/mach-tegra/board186.c
parent0e2b5350d9523c9b2dca57b98c89f031691d23e3 (diff)
ARM: tegra: pick up actual memory size
On Tegra186, U-Boot is booted by the binary firmware as if it were a Linux kernel. Consequently, a DTB is passed to U-Boot. Cache the address of that DTB, and parse the /memory/reg property to determine the actual RAM regions that U-Boot and subsequent EL2/EL1 SW may actually use. Given the binary FW passes a DTB to U-Boot, I anticipate the suggestion that U-Boot use that DTB as its control DTB. I don't believe that would work well, so I do not plan to put any effort into this. By default the FW-supplied DTB is the L4T kernel's DTB, which uses non-upstreamed DT bindings. U-Boot aims to use only upstreamed DT bindings, or as close as it can get. Replacing this DTB with a DTB using upstream bindings is physically quite easy; simply replace the content of one of the GPT partitions on the eMMC. However, the binary FW at least partially relies on the existence/content of some nodes in the DTB, and that requires the DTB to be written according to downstream bindings. Equally, if U-Boot continues to use appended DTBs built from its own source tree, as it does for all other Tegra platforms, development and deployment is much easier. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra/board186.c')
-rw-r--r--arch/arm/mach-tegra/board186.c12
1 files changed, 0 insertions, 12 deletions
diff --git a/arch/arm/mach-tegra/board186.c b/arch/arm/mach-tegra/board186.c
index f4b6152a79..876ccba5e5 100644
--- a/arch/arm/mach-tegra/board186.c
+++ b/arch/arm/mach-tegra/board186.c
@@ -11,12 +11,6 @@
DECLARE_GLOBAL_DATA_PTR;
-int dram_init(void)
-{
- gd->ram_size = (1.5 * 1024 * 1024 * 1024);
- return 0;
-}
-
int board_early_init_f(void)
{
return 0;
@@ -32,12 +26,6 @@ int board_late_init(void)
return 0;
}
-void dram_init_banksize(void)
-{
- gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE;
- gd->bd->bi_dram[0].size = gd->ram_size;
-}
-
void pad_init_mmc(struct mmc_host *host)
{
}