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sandbox: Allow chaining from SPL to U-Boot proper

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SPL is expected to load and run U-Boot. This needs to work with sandbox also.
Provide a function to locate the U-Boot image, and another to start it. This
allows SPL to function on sandbox as it does on other archs.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2016-07-04 11:57:45 -06:00
parent 72a7e07604
commit d4e33f5a72
2 changed files with 76 additions and 0 deletions
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51
arch/sandbox/cpu/os.c
View file

@ -541,6 +541,57 @@ int os_jump_to_image(const void *dest, int size)
return unlink(fname);
}
int os_find_u_boot(char *fname, int maxlen)
{
struct sandbox_state *state = state_get_current();
const char *progname = state->argv[0];
int len = strlen(progname);
char *p;
int fd;
if (len >= maxlen || len < 4)
return -ENOSPC;
/* Look for 'u-boot' in the same directory as 'u-boot-spl' */
strcpy(fname, progname);
if (!strcmp(fname + len - 4, "-spl")) {
fname[len - 4] = '\0';
fd = os_open(fname, O_RDONLY);
if (fd >= 0) {
close(fd);
return 0;
}
}
/* Look for 'u-boot' in the parent directory of spl/ */
p = strstr(fname, "/spl/");
if (p) {
strcpy(p, p + 4);
fd = os_open(fname, O_RDONLY);
if (fd >= 0) {
close(fd);
return 0;
}
}
return -ENOENT;
}
int os_spl_to_uboot(const char *fname)
{
struct sandbox_state *state = state_get_current();
char *argv[state->argc + 1];
int ret;
memcpy(argv, state->argv, sizeof(char *) * (state->argc + 1));
argv[0] = (char *)fname;
ret = execv(fname, argv);
if (ret)
return ret;
return unlink(fname);
}
void os_localtime(struct rtc_time *rt)
{
time_t t = time(NULL);

25
include/os.h
View file

@ -286,6 +286,31 @@ int os_read_ram_buf(const char *fname);
*/
int os_jump_to_image(const void *dest, int size);
/**
* os_find_u_boot() - Determine the path to U-Boot proper
*
* This function is intended to be called from within sandbox SPL. It uses
* a few heuristics to find U-Boot proper. Normally it is either in the same
* directory, or the directory above (since u-boot-spl is normally in an
* spl/ subdirectory when built).
*
* @fname: Place to put full path to U-Boot
* @maxlen: Maximum size of @fname
* @return 0 if OK, -NOSPC if the filename is too large, -ENOENT if not found
*/
int os_find_u_boot(char *fname, int maxlen);
/**
* os_spl_to_uboot() - Run U-Boot proper
*
* When called from SPL, this runs U-Boot proper. The filename is obtained by
* calling os_find_u_boot().
*
* @fname: Full pathname to U-Boot executable
* @return 0 if OK, -ve on error
*/
int os_spl_to_uboot(const char *fname);
/**
* Read the current system time
*