diff options
| author | Stephan Gerhold | 2021-07-07 12:58:54 +0200 |
|---|---|---|
| committer | Tom Rini | 2021-07-14 16:48:11 -0400 |
| commit | 03585d52fcb7c4f769b9af32085dcc365f39edbc (patch) | |
| tree | 72feb4d627eab2165a55b4247e5d59f8a2b8f583 /include/configs | |
| parent | 9e9074bcdd52e0e898c668eaac9555504370cc92 (diff) | |
board: stemmy: Parse atags to get available memory
At the moment the "stemmy" board attempts to detect the RAM size with
a simple memory test (get_ram_size()). Unfortunately, this does not work
correctly for devices with 768 MiB RAM (e.g. Samsung Galaxy Ace 2
(GT-I8160), "codina"). Reading/writing memory after the 768 MiB RAM
succeeds but actually overwrites some earlier parts of the memory.
For U-Boot this does not result in any major problems, but on Linux
this will eventually lead to strange crashes because of the memory
corruption.
Since the "stemmy" U-Boot port is designed to be chainloaded from
the original Samsung bootloader, the most reliable way to get the
available amount of RAM is to look at the ATAGS passed by the Samsung
bootloader. Fortunately, the header used to generate ATAGS in U-Boot
(asm/setup.h) can also be easily used to parse them.
Also clarify and simplify stemmy.h a bit to make it more clear where
some of the magic values in there are actually coming from.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/configs')
| -rw-r--r-- | include/configs/stemmy.h | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/include/configs/stemmy.h b/include/configs/stemmy.h index 922eec43ee1..c446b092708 100644 --- a/include/configs/stemmy.h +++ b/include/configs/stemmy.h @@ -7,23 +7,20 @@ #include <linux/sizes.h> -#define CONFIG_SKIP_LOWLEVEL_INIT /* Loaded by another bootloader */ -#define CONFIG_SYS_MALLOC_LEN SZ_2M +/* + * The "stemmy" U-Boot port is designed to be chainloaded by the Samsung + * bootloader on devices based on ST-Ericsson Ux500. Therefore, we skip most + * low-level initialization and rely on configuration provided by the Samsung + * bootloader. New images are loaded at the same address for compatibility. + */ +#define CONFIG_SKIP_LOWLEVEL_INIT +#define CONFIG_SYS_INIT_SP_ADDR CONFIG_SYS_TEXT_BASE +#define CONFIG_SYS_LOAD_ADDR CONFIG_SYS_TEXT_BASE -/* Physical Memory Map */ -#define PHYS_SDRAM_1 0x00000000 /* DDR-SDRAM Bank #1 */ -#define CONFIG_SYS_SDRAM_BASE PHYS_SDRAM_1 -#define CONFIG_SYS_SDRAM_SIZE SZ_1G -#define CONFIG_SYS_INIT_RAM_SIZE 0x00100000 -#define CONFIG_SYS_GBL_DATA_OFFSET (CONFIG_SYS_SDRAM_BASE + \ - CONFIG_SYS_INIT_RAM_SIZE - \ - GENERATED_GBL_DATA_SIZE) -#define CONFIG_SYS_INIT_SP_ADDR CONFIG_SYS_GBL_DATA_OFFSET +#define CONFIG_SYS_MALLOC_LEN SZ_2M /* FIXME: This should be loaded from device tree... */ #define CONFIG_SYS_L2_PL310 #define CONFIG_SYS_PL310_BASE 0xa0412000 -#define CONFIG_SYS_LOAD_ADDR 0x00100000 - #endif |