/* * U-boot - bootldr.c * * Copyright (c) 2005-2008 Analog Devices Inc. * * See file CREDITS for list of people who contributed to this * project. * * Licensed under the GPL-2 or later. */ #include <config.h> #include <common.h> #include <command.h> #include <asm/blackfin.h> #include <asm/mach-common/bits/bootrom.h> /* Simple sanity check on the specified address to make sure it contains * an LDR image of some sort. */ static bool ldr_valid_signature(uint8_t *data) { #if defined(__ADSPBF561__) /* BF56x has a 4 byte global header */ if (data[3] == 0xA0) return true; #elif defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \ defined(__ADSPBF534__) || defined(__ADSPBF536__) || defined(__ADSPBF537__) || \ defined(__ADSPBF538__) || defined(__ADSPBF539__) /* all the BF53x should start at this address mask */ uint32_t addr; memmove(&addr, data, sizeof(addr)); if ((addr & 0xFF0FFF0F) == 0xFF000000) return true; #else /* everything newer has a magic byte */ uint32_t count; memmove(&count, data + 8, sizeof(count)); if (data[3] == 0xAD && count == 0) return true; #endif return false; } /* If the Blackfin is new enough, the Blackfin on-chip ROM supports loading * LDRs from random memory addresses. So whenever possible, use that. In * the older cases (BF53x/BF561), parse the LDR format ourselves. */ #define ZEROFILL 0x0001 #define RESVECT 0x0002 #define INIT 0x0008 #define IGNORE 0x0010 #define FINAL 0x8000 static void ldr_load(uint8_t *base_addr) { #if defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \ /*defined(__ADSPBF534__) || defined(__ADSPBF536__) || defined(__ADSPBF537__) ||*/\ defined(__ADSPBF538__) || defined(__ADSPBF539__) || defined(__ADSPBF561__) uint32_t addr; uint32_t count; uint16_t flags; /* the bf56x has a 4 byte global header ... but it is useless to * us when booting an LDR from a memory address, so skip it */ # ifdef __ADSPBF561__ base_addr += 4; # endif memmove(&flags, base_addr + 8, sizeof(flags)); bfin_write_EVT1(flags & RESVECT ? 0xFFA00000 : 0xFFA08000); do { /* block header may not be aligned */ memmove(&addr, base_addr, sizeof(addr)); memmove(&count, base_addr+4, sizeof(count)); memmove(&flags, base_addr+8, sizeof(flags)); base_addr += sizeof(addr) + sizeof(count) + sizeof(flags); printf("loading to 0x%08x (0x%x bytes) flags: 0x%04x\n", addr, count, flags); if (!(flags & IGNORE)) { if (flags & ZEROFILL) memset((void *)addr, 0x00, count); else memcpy((void *)addr, base_addr, count); if (flags & INIT) { void (*init)(void) = (void *)addr; init(); } } if (!(flags & ZEROFILL)) base_addr += count; } while (!(flags & FINAL)); #endif } /* For BF537, we use the _BOOTROM_BOOT_DXE_FLASH funky ROM function. * For all other BF53x/BF56x, we just call the entry point. * For everything else (newer), we use _BOOTROM_MEMBOOT ROM function. */ static void ldr_exec(void *addr) { #if defined(__ADSPBF534__) || defined(__ADSPBF536__) || defined(__ADSPBF537__) /* restore EVT1 to reset value as this is what the bootrom uses as * the default entry point when booting the final block of LDRs */ bfin_write_EVT1(L1_INST_SRAM); __asm__("call (%0);" : : "a"(_BOOTROM_MEMBOOT), "q7"(addr) : "RETS", "memory"); #elif defined(__ADSPBF531__) || defined(__ADSPBF532__) || defined(__ADSPBF533__) || \ defined(__ADSPBF538__) || defined(__ADSPBF539__) || defined(__ADSPBF561__) void (*ldr_entry)(void) = (void *)bfin_read_EVT1(); ldr_entry(); #else int32_t (*BOOTROM_MEM)(void *, int32_t, int32_t, void *) = (void *)_BOOTROM_MEMBOOT; BOOTROM_MEM(addr, 0, 0, NULL); #endif } /* * the bootldr command loads an address, checks to see if there * is a Boot stream that the on-chip BOOTROM can understand, * and loads it via the BOOTROM Callback. It is possible * to also add booting from SPI, or TWI, but this function does * not currently support that. */ int do_bootldr(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) { void *addr; /* Get the address */ if (argc < 2) addr = (void *)load_addr; else addr = (void *)simple_strtoul(argv[1], NULL, 16); /* Check if it is a LDR file */ if (ldr_valid_signature(addr)) { printf("## Booting ldr image at 0x%p ...\n", addr); ldr_load(addr); icache_disable(); dcache_disable(); ldr_exec(addr); } else printf("## No ldr image at address 0x%p\n", addr); return 0; } U_BOOT_CMD(bootldr, 2, 0, do_bootldr, "boot ldr image from memory", "[addr]\n" " - boot ldr image stored in memory\n");