Currently the NOR & NAND support in Linux only works for the "standard" Sequoia, the version booting for NOR flash. The NAND-booting version has the chip-selects swapped. Here the chip-select mappings:
"Standard" NOR-booting version: CS0 NOR CS3 NAND
NAND-booting version: CS0 NAND CS3 NOR
With this path the dtb gets fixed-up, so that the correct chip-select numbers are patched in the dtb enabling correct NOR & NAND support in Linux on the NAND-booting Sequoia version.
Signed-off-by: Stefan Roese sr@denx.de --- board/amcc/sequoia/sequoia.c | 58 ++++++++++++++++++++++++++++++++++++++++- 1 files changed, 56 insertions(+), 2 deletions(-)
diff --git a/board/amcc/sequoia/sequoia.c b/board/amcc/sequoia/sequoia.c index d6668e2..e824b8f 100644 --- a/board/amcc/sequoia/sequoia.c +++ b/board/amcc/sequoia/sequoia.c @@ -1,5 +1,5 @@ /* - * (C) Copyright 2006-2007 + * (C) Copyright 2006-2009 * Stefan Roese, DENX Software Engineering, sr@denx.de. * * (C) Copyright 2006 @@ -35,7 +35,8 @@ DECLARE_GLOBAL_DATA_PTR;
extern flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
-ulong flash_get_size (ulong base, int banknum); +extern void __ft_board_setup(void *blob, bd_t *bd); +ulong flash_get_size(ulong base, int banknum);
int board_early_init_f(void) { @@ -513,3 +514,56 @@ int post_hotkeys_pressed(void) return 0; /* No hotkeys supported */ } #endif /* CONFIG_POST */ + +#if defined(CONFIG_NAND_U_BOOT) +/* + * On NAND-booting sequoia, we need to patch the chips select numbers + * in the dtb (CS0 - NAND, CS3 - NOR) + */ +void ft_board_setup(void *blob, bd_t *bd) +{ + int rc; + int len; + int nodeoffset; + struct fdt_property *prop; + u32 *reg; + char path[32]; + + /* First do common fdt setup */ + __ft_board_setup(blob, bd); + + /* And now configure NOR chip select to 3 instead of 0 */ + strcpy(path, "/plb/opb/ebc/nor_flash@0,0"); + nodeoffset = fdt_path_offset(blob, path); + prop = fdt_get_property_w(blob, nodeoffset, "reg", &len); + if (prop == NULL) { + printf("Unable to update NOR chip select for NAND booting\n"); + return; + } + reg = (u32 *)&prop->data[0]; + reg[0] = 3; + rc = fdt_find_and_setprop(blob, path, "reg", reg, 3 * sizeof(u32), 1); + if (rc) { + printf("Unable to update property NOR mappings, err=%s\n", + fdt_strerror(rc)); + return; + } + + /* And now configure NAND chip select to 0 instead of 3 */ + strcpy(path, "/plb/opb/ebc/ndfc@3,0"); + nodeoffset = fdt_path_offset(blob, path); + prop = fdt_get_property_w(blob, nodeoffset, "reg", &len); + if (prop == NULL) { + printf("Unable to update NDFC chip select for NAND booting\n"); + return; + } + reg = (u32 *)&prop->data[0]; + reg[0] = 0; + rc = fdt_find_and_setprop(blob, path, "reg", reg, 3 * sizeof(u32), 1); + if (rc) { + printf("Unable to update property NDFC mappings, err=%s\n", + fdt_strerror(rc)); + return; + } +} +#endif /* CONFIG_NAND_U_BOOT */