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-rw-r--r--gnu/build/image.scm5
1 files changed, 4 insertions, 1 deletions
diff --git a/gnu/build/image.scm b/gnu/build/image.scm
index 2327cfbb45..65a0373980 100644
--- a/gnu/build/image.scm
+++ b/gnu/build/image.scm
@@ -111,7 +111,10 @@ turn doesn't take any constant overhead into account, force a 1-MiB minimum."
(if (eq? size 'guess)
(estimate-partition-size root)
size))
- (if (member 'esp flags) (list "-S" "1024") '()))
+ ;; u-boot in particular needs the formatted block
+ ;; size and the physical block size to be equal.
+ ;; TODO: What about 4k blocks?
+ (if (member 'esp flags) (list "-S" "512") '()))
(for-each (lambda (file)
(unless (member file '("." ".."))
(invoke "mcopy" "-bsp" "-i" target