Change in coreboot[master]: [TEST-ONLY / HACK] Mirror payload in RAM before hashing/decompression

[Julius Werner (Code Review)]

Julius Werner has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/59767 )

Change subject: [TEST-ONLY / HACK] Mirror payload in RAM before hashing/decompression
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[TEST-ONLY / HACK] Mirror payload in RAM before hashing/decompression

I don't know if this does anything... let's find out.

Signed-off-by: Julius Werner 
Change-Id: Ia9550ad35653f1c949fe1dd83f76142ed3dbad4c
---
M src/lib/cbfs.c
1 file changed, 10 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/67/59767/1

diff --git a/src/lib/cbfs.c b/src/lib/cbfs.c
index dfb7a69..5906814 100644
--- a/src/lib/cbfs.c
+++ b/src/lib/cbfs.c
@@ -470,6 +470,16 @@
    if (!force_ro && get_preload_rdev(&rdev, name) == CB_SUCCESS)
    	preload_successful = true;

+	if (ENV_RAMSTAGE && !strcmp(name, CONFIG_CBFS_PREFIX "/payload")) {
+		size_t size = region_device_sz(&rdev);
+		void *buffer = bootmem_allocate_buffer(size);
+		if (!buffer ||
+		    rdev_readat_full(&rdev, buffer) != size ||
+		    rdev_chain_mem(&rdev, buffer, size) != 0)
+			die("splat!");
+		printk(BIOS_DEBUG, "HACK: mirrored payload rdev into RAM at %p\n", buffer);
+	}
+
    void *ret = do_alloc(&mdata, &rdev, allocator, arg, size_out, false);

/* When using cbfs_preload we need to free the preload buffer after populating the