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fdt: Add a command to show reserved-memory regions

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Add a new 'fdt reserved' subcommand that displays all reserved memory
regions defined in the device tree's /reserved-memory node. This command
provides a formatted table showing the ID, name, start address, and size
of each reserved memory region.

Avoid a conflict with the existing 'fdt resize' command. Update the docs
and add a test.

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-08-27 14:40:19 -06:00
parent ecca5cc322
commit 0dc72120b7
5 changed files with 89 additions and 3 deletions
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40
test/cmd/fdt.c
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@@ -1464,3 +1464,43 @@ static int fdt_test_apply(struct unit_test_state *uts)
return 0;
}
FDT_TEST(fdt_test_apply, UTF_CONSOLE);
/* Test 'fdt reserved' reading reserved-memory nodes */
static int fdt_test_reserved(struct unit_test_state *uts)
{
struct fdt_header *old_working_fdt;
char fdt[8192];
ulong addr;
if (!IS_ENABLED(CONFIG_SANDBOX))
return -EAGAIN;
/* Save the original working_fdt */
old_working_fdt = working_fdt;
/* Set working_fdt to control FDT (sandbox has reserved memory) */
working_fdt = (struct fdt_header *)gd->fdt_blob;
ut_assertok(run_command("fdt reserved", 0));
/* Just verify we get the header */
ut_assert_nextlinen("ID");
ut_assert_nextlinen("------");
/* Verify we get a tcg_event_log entry with correct address/size */
ut_assert_nextline("0 tcg_event_log 100000 2000 ");
/* Test with FDT that has no reserved-memory node */
ut_assertok(make_test_fdt(uts, fdt, sizeof(fdt), &addr));
ut_assertok(run_command("fdt reserved", 0));
ut_assert_nextlinen("ID Name Start Size");
ut_assert_nextline("----------------------------------------------------------------");
ut_assert_nextline("No /reserved-memory node found in device tree");
ut_assert_console_end();
/* Restore the original working_fdt */
working_fdt = old_working_fdt;
return 0;
}
FDT_TEST(fdt_test_reserved, UTF_CONSOLE);