[PATCH] bootstd: Scan all bootdevs in a boot_targets entry

Simon Glass
2023-09-23T20:50:26Z

When the boot_targets environment variable is used with the distro-boot
scripts, each device is included individually. For example, if there
are three mmc devices, then we will have something like:

boot_targets="mmc0 mmc1 mmc2"

In contrast, standard boot supports specifying just the uclass, i.e.:

boot_targets="mmc"

The intention is that this should scan all MMC devices, but in fact it
currently only scans the first.

Update the logic to handle this case, without required BOOTSTD_FULL to
be enabled.

I believe at least three people reported this, but I found two.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Date Huang <tjjh89017@hotmail.com>
Reported-by: Vincent Stehlé <vincent.stehle@arm.com>
---

boot/bootdev-uclass.c | 3 ++-
boot/bootflow.c | 21 +++++++++++++++++++--
test/boot/bootdev.c | 10 ++++++++++
3 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/boot/bootdev-uclass.c b/boot/bootdev-uclass.c
index fa52bc3a9c4e..5a60cf223c79 100644
--- a/boot/bootdev-uclass.c
+++ b/boot/bootdev-uclass.c
@@ -460,10 +460,11 @@ int bootdev_find_by_label(const char *label, struct udevice **devp,
* if no sequence number was provided, we must scan all
* bootdevs for this media uclass
*/
- if (IS_ENABLED(CONFIG_BOOTSTD_FULL) && seq == -1)
+ if (seq == -1)
method_flags |= BOOTFLOW_METHF_SINGLE_UCLASS;
if (method_flagsp)
*method_flagsp = method_flags;
+ log_debug("method flags %x\n", method_flags);
return 0;
}
log_debug("- no device in %s\n", media->name);
diff --git a/boot/bootflow.c b/boot/bootflow.c
index 81b5829d5b37..74abf3e17d7e 100644
--- a/boot/bootflow.c
+++ b/boot/bootflow.c
@@ -260,8 +260,25 @@ static int iter_incr(struct bootflow_iter *iter)
} else {
log_debug("labels %p\n", iter->labels);
if (iter->labels) {
- ret = bootdev_next_label(iter, &dev,
- &method_flags);
+ /*
+ * when the label is "mmc" we want to scan all
+ * mmc bootdevs, not just the first. See
+ * bootdev_find_by_label() where this flag is
+ * set up
+ */
+ if (iter->method_flags & BOOTFLOW_METHF_SINGLE_UCLASS) {
+ uclass_next_device(&dev);
+ log_debug("looking for next device %s: %s\n",
+ iter->dev->name,
+ dev ? dev->name : "<none>");
+ } else {
+ dev = NULL;
+ }
+ if (!dev) {
+ log_debug("looking at next label\n");
+ ret = bootdev_next_label(iter, &dev,
+ &method_flags);
+ }
} else {
ret = bootdev_next_prio(iter, &dev);
method_flags = 0;
diff --git a/test/boot/bootdev.c b/test/boot/bootdev.c
index 6b29213416db..c5f14a7a1323 100644
--- a/test/boot/bootdev.c
+++ b/test/boot/bootdev.c
@@ -221,6 +221,16 @@ static int bootdev_test_order(struct unit_test_state *uts)
ut_asserteq_str("mmc2.bootdev", iter.dev_used[1]->name);
bootflow_iter_uninit(&iter);

+ /* Make sure it scans a bootdevs in each target */
+ ut_assertok(env_set("boot_targets", "mmc spi"));
+ ut_asserteq(0, bootflow_scan_first(NULL, NULL, &iter, 0, &bflow));
+ ut_asserteq(-ENODEV, bootflow_scan_next(&iter, &bflow));
+ ut_asserteq(3, iter.num_devs);
+ ut_asserteq_str("mmc2.bootdev", iter.dev_used[0]->name);
+ ut_asserteq_str("mmc1.bootdev", iter.dev_used[1]->name);
+ ut_asserteq_str("mmc0.bootdev", iter.dev_used[2]->name);
+ bootflow_iter_uninit(&iter);
+
return 0;
}
BOOTSTD_TEST(bootdev_test_order, UT_TESTF_DM | UT_TESTF_SCAN_FDT);
--
2.42.0.515.g380fc7ccd1-goog