diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/global_data.h | 1 | ||||
| -rw-r--r-- | include/fdt_support.h | 10 | ||||
| -rw-r--r-- | include/fdtdec.h | 38 |
3 files changed, 48 insertions, 1 deletions
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h index 2d451f8a1b4..0fd4900392b 100644 --- a/include/asm-generic/global_data.h +++ b/include/asm-generic/global_data.h @@ -52,6 +52,7 @@ typedef struct global_data { unsigned long env_has_init; /* Bitmask of boolean of struct env_location offsets */ int env_load_location; + unsigned long ram_base; /* Base address of RAM used by U-Boot */ unsigned long ram_top; /* Top address of RAM used by U-Boot */ unsigned long relocaddr; /* Start address of U-Boot in RAM */ phys_size_t ram_size; /* RAM size */ diff --git a/include/fdt_support.h b/include/fdt_support.h index e6c43ea9838..a9a0078af66 100644 --- a/include/fdt_support.h +++ b/include/fdt_support.h @@ -283,6 +283,16 @@ int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width, int fdt_overlay_apply_verbose(void *fdt, void *fdto); +/** + * fdt_get_cells_len() - Get the length of a type of cell in top-level nodes + * + * Returns the length of the cell type in bytes (4 or 8). + * + * @blob: Pointer to device tree blob + * @nr_cells_name: Name to lookup, e.g. "#address-cells" + */ +int fdt_get_cells_len(const void *blob, char *nr_cells_name); + #endif /* ifdef CONFIG_OF_LIBFDT */ #ifdef USE_HOSTCC diff --git a/include/fdtdec.h b/include/fdtdec.h index c15b2a04a7a..332105504b4 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -41,6 +41,8 @@ struct fdt_memory { fdt_addr_t end; }; +struct bd_info; + #ifdef CONFIG_SPL_BUILD #define SPL_BUILD 1 #else @@ -993,6 +995,40 @@ int fdtdec_setup(void); * Called when CONFIG_OF_BOARD is defined, or if CONFIG_OF_SEPARATE is defined * and the board implements it. */ -void *board_fdt_blob_setup(void); + +/* + * Decode the size of memory + * + * RAM size is normally set in a /memory node and consists of a list of + * (base, size) cells in the 'reg' property. This information is used to + * determine the total available memory as well as the address and size + * of each bank. + * + * Optionally the memory configuration can vary depending on a board id, + * typically read from strapping resistors or an EEPROM on the board. + * + * Finally, memory size can be detected (within certain limits) by probing + * the available memory. It is safe to do so within the limits provides by + * the board's device tree information. This makes it possible to produce + * boards with different memory sizes, where the device tree specifies the + * maximum memory configuration, and the smaller memory configuration is + * probed. + * + * This function decodes that information, returning the memory base address, + * size and bank information. See the memory.txt binding for full + * documentation. + * + * @param blob Device tree blob + * @param area Name of node to check (NULL means "/memory") + * @param board_id Board ID to look up + * @param basep Returns base address of first memory bank (NULL to + * ignore) + * @param sizep Returns total memory size (NULL to ignore) + * @param bd Updated with the memory bank information (NULL to skip) + * @return 0 if OK, -ve on error + */ +int fdtdec_decode_ram_size(const void *blob, const char *area, int board_id, + phys_addr_t *basep, phys_size_t *sizep, + struct bd_info *bd); #endif |