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