[S] Change in flashrom[master]: tests: ensure chip erase operation is executed

[Nikolai Artemiev (Code Review)]

Nikolai Artemiev has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/69130 )

Change subject: tests: ensure chip erase operation is executed
......................................................................

tests: ensure chip erase operation is executed

The `full_chip_erase_with_wp_dummyflasher_test_success` test case
checks that erasing a write-protected region of a dummyflasher chip
fails.

However erase optimization may cause the erase operation to be skipped
if the flash contents are already erased, so the erase operation appears
to succeed and the test case fails.

Writing a non-erased value to the chip ensures that an erase operation
will be exectued and (hopefully) fail due to write protection.

BUG=b:237620197
BRANCH=none
TEST=ninja test

Change-Id: Ia00444dcd2ad96c64832a13201efbd064cd7302d
Signed-off-by: Nikolai Artemiev 
---
M include/flash.h
M tests/chip_wp.c
2 files changed, 35 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/30/69130/1

diff --git a/include/flash.h b/include/flash.h
index 2ba235d..f0c6026 100644
--- a/include/flash.h
+++ b/include/flash.h
@@ -156,6 +156,7 @@
 #define FEATURE_WRSR3		(1 << 23)

#define ERASED_VALUE(flash)	(((flash)->chip->feature_bits & FEATURE_ERASED_ZERO) ? 0x00 : 0xff)
+#define UNERASED_VALUE(flash)	(((flash)->chip->feature_bits & FEATURE_ERASED_ZERO) ? 0xff : 0x00)

enum test_state {
    OK = 0,
diff --git a/tests/chip_wp.c b/tests/chip_wp.c
index 8f6cb5f..739c4f9 100644
--- a/tests/chip_wp.c
+++ b/tests/chip_wp.c
@@ -63,6 +63,7 @@
 static const struct flashchip chip_W25Q128_V = {
    .vendor		= "aklm&dummyflasher",
    .total_size	= 16 * 1024,
+	.page_size	= 1024,
    .tested		= TEST_OK_PREW,
    .read		= SPI_CHIP_READ,
    .write		= SPI_CHIP_WRITE256,
@@ -268,6 +269,14 @@
       this stage WP is not enabled and erase completes successfully. */
    assert_int_equal(0, flashrom_flash_erase(&flash));

+	/* Write non-erased value to entire chip so that erase operations cannot
+	 * be optimized away. */
+	unsigned long size = flashrom_flash_getsize(&flash);
+	uint8_t *const contents = malloc(size);
+	memset(contents, UNERASED_VALUE(&flash), size);
+	assert_int_equal(0, flashrom_image_write(&flash, contents, size, NULL));
+	free(contents);
+
    assert_int_equal(0, flashrom_wp_read_cfg(wp_cfg, &flash));

/* Hardware-protect first 4 KiB. */