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librem5: properly set the fdtfile env variable

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In order to use the generic "distro boot" using an extlinux.conf file,
the `fdtfile` environment variable is mandatory. This commit ensure this
variable is properly constructed based on the detected board revision.

Signed-off-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
This commit is contained in:
Arnaud Ferraris 2023-10-27 15:40:44 +02:00 committed by Fabio Estevam
parent 4c303a3895
commit 4ae3fcdf7b
1 changed files with 26 additions and 1 deletions
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27
board/purism/librem5/librem5.c
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@ -399,21 +399,46 @@ int board_init(void)
int board_late_init(void)
{
if (IS_ENABLED(CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG)) {
u32 rev;
/*
* Use the r4 dtb by default as those are the most
* widespread devices.
*/
u32 rev, dtb_rev = 4;
char rev_str[3];
char fdt_str[50];
env_set("board_name", "librem5");
if (fuse_read(9, 0, &rev)) {
env_set("board_rev", BOARD_REV_ERROR);
} else if (rev == 0) {
/*
* If the fuses aren't burnt we should use either the
* r2 or r3 DTB. The latter makes more sense as there
* are far more r3 devices out there.
*/
dtb_rev = 3;
env_set("board_rev", BOARD_REV_UNKNOWN);
} else if (rev > 0) {
if (rev == 1)
dtb_rev = 2;
else if (rev < dtb_rev)
dtb_rev = rev;
/*
* FCC-approved devices report '5' as their board
* revision but use the r4 DTB as the PCB's are
* functionally identical.
*/
else if (rev == 5)
dtb_rev = 4;
sprintf(rev_str, "%u", rev);
env_set("board_rev", rev_str);
}
printf("Board name: %s\n", env_get("board_name"));
printf("Board rev: %s\n", env_get("board_rev"));
sprintf(fdt_str, "freescale/imx8mq-librem5-r%u.dtb", dtb_rev);
env_set("fdtfile", fdt_str);
}
if (is_usb_boot()) {