Author: manu
Date: Wed Jul 4 07:37:45 2018
New Revision: 335933
URL: https://svnweb.freebsd.org/changeset/base/335933
Log:
loader: fdt: Try to load every possible DTB from u-boot
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
Modified:
head/stand/uboot/fdt/uboot_fdt.c
Modified: head/stand/uboot/fdt/uboot_fdt.c
==============================================================================
--- head/stand/uboot/fdt/uboot_fdt.c Wed Jul 4 06:47:34 2018
(r335932)
+++ head/stand/uboot/fdt/uboot_fdt.c Wed Jul 4 07:37:45 2018
(r335933)
@@ -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;
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