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loader: fdt: Try to load every possible DTB from u-boot

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U-Boot setup a few variables :

 - fdt_addr which is the board static dtb (most of the time loaded before
   u-boot or coming from some hardware like a ROM)
 - fdt_addr_r which is a location in RAM that holds the DTB loaded by
   u-boot or before u-boot

In the case of u-boot + rpi firmware the DTB is loaded in RAM but the location
still end up in the fdt_addr variable and the fdt_addr_r variable exist.

Change the behavior so we test that a DTB exists for every possible variable :

 - fdt_addr_r is checked first as if u-boot needed to modify it the
   correct DTB will live there.
 - fdt_addr is checked second as if we run on a hardware with DTB in ROM
   it means that we what/need to run that
 - fdtaddr looks like a FreeBSD-ism but since I'm not sure leave it.

Reviewed by:	gonzo
Differential Revision:	https://reviews.freebsd.org/D16101
This commit is contained in:
Emmanuel Vadot 2018-07-04 07:37:45 +00:00
parent 5ba05d3d0e
commit 7fcce9c487
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=335933
1 changed files with 30 additions and 16 deletions
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46
stand/uboot/fdt/uboot_fdt.c
View File

@ -39,6 +39,30 @@ __FBSDID("$FreeBSD$");
#define STR(number) #number
#define STRINGIFY(number) STR(number)
static int
fdt_platform_load_from_ubenv(const char *var)
{
struct fdt_header *hdr;
const char *s;
char *p;
s = ub_env_get(var);
if (s == NULL || *s == '\0')
return (1);
hdr = (struct fdt_header *)strtoul(s, &p, 16);
if (*p != '\0')
return (1);
if (fdt_load_dtb_addr(hdr) == 0) {
printf("Using DTB provided by U-Boot at "
"address %p.\n", hdr);
return (0);
}
return (1);
}
int
fdt_platform_load_dtb(void)
{
@ -53,22 +77,12 @@ fdt_platform_load_dtb(void)
* variable for fdt data loaded into ram is fdt_addr_r, so try that
* first. Board vendors also use both fdtaddr and fdt_addr names.
*/
s = ub_env_get("fdt_addr_r");
if (s == NULL)
s = ub_env_get("fdtaddr");
if (s == NULL)
s = ub_env_get("fdt_addr");
if (s != NULL && *s != '\0') {
hdr = (struct fdt_header *)strtoul(s, &p, 16);
if (*p == '\0') {
if (fdt_load_dtb_addr(hdr) == 0) {
printf("Using DTB provided by U-Boot at "
"address %p.\n", hdr);
rv = 0;
goto exit;
}
}
}
if ((rv = fdt_platform_load_from_ubenv("fdt_addr_r")) == 0)
goto exit;
if ((rv = fdt_platform_load_from_ubenv("fdt_addr")) == 0)
goto exit;
if ((rv = fdt_platform_load_from_ubenv("fdtaddr")) == 0)
goto exit;
rv = 1;