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Blackfin: bootldr: implement BF53x/BF56x LDR loader

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The BF53x/BF56x parts do not have an on-chip ROM to boot LDRs out of
arbitrary memory locations, so implement a basic one in software.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2008-10-11 22:08:42 -04:00
parent 8b35e3aeff
commit 29d4ea0a90
1 changed files with 124 additions and 13 deletions
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137
common/cmd_bootldr.c
View File

@ -16,6 +16,127 @@
#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__)
void *ret;
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) = 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,
@ -23,11 +144,9 @@
* 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;
uint32_t *data;
/* Get the address */
if (argc < 2)
@ -36,22 +155,14 @@ int do_bootldr(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
addr = (void *)simple_strtoul(argv[1], NULL, 16);
/* Check if it is a LDR file */
data = addr;
#if defined(__ADSPBF54x__) || defined(__ADSPBF52x__)
if ((*data & 0xFF000000) == 0xAD000000 && data[2] == 0x00000000) {
#else
if (*data == 0xFF800060 || *data == 0xFF800040 || *data == 0xFF800020) {
#endif
/* We want to boot from FLASH or SDRAM */
if (ldr_valid_signature(addr)) {
printf("## Booting ldr image at 0x%p ...\n", addr);
ldr_load(addr);
icache_disable();
dcache_disable();
__asm__(
"jump (%1);"
:
: "q7" (addr), "a" (_BOOTROM_MEMBOOT));
ldr_exec(addr);
} else
printf("## No ldr image at address 0x%p\n", addr);