Characters A9/AA in the kernel codeset are ⌐/¬
(this is consistent with and documented inline in most other fonts).

However:
  $ cat Acorn8x8.x/a9-⌐.x
   ██████
       ██
  $ cat Acorn8x8.x/aa-¬.x
   ██████
       ██

0x7e 01111110 -> 01111110 0x7e
0x06 00000110 -> 01100000 0x60

Thus:
  $ cat Acorn8x8.x/a9-⌐.x
   ██████
   ██
  $ cat Acorn8x8.x/aa-¬.x
   ██████
       ██

Fixes: "[ARM PATCH] 1717/1: Add German umlauts to Acorn console font"
 (first in Linux 2.6.2)
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
---
There doesn't seem to be a maintainer listed for lib/fonts/,
so Cc: Andrew per spec and Simona since she's the committer
for the latest few commits on this file? Hope that's right.

 lib/fonts/font_acorn_8x8.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/fonts/font_acorn_8x8.c b/lib/fonts/font_acorn_8x8.c
index 18755c33d249..2e7b6c73a231 100644
--- a/lib/fonts/font_acorn_8x8.c
+++ b/lib/fonts/font_acorn_8x8.c
@@ -176,7 +176,7 @@ static const struct font_data acorndata_8x8 = {
 /* A6 */  0x1c, 0x06, 0x1e, 0x36, 0x1e, 0x00, 0x3e, 0x00,
 /* A7 */  0x1c, 0x36, 0x36, 0x36, 0x1c, 0x00, 0x3e, 0x00,
 /* A8 */  0x18, 0x00, 0x18, 0x18, 0x30, 0x66, 0x3c, 0x00,
-/* A9 */  0x7e, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+/* A9 */  0x7e, 0x60, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 /* AA */  0x7e, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 /* AB */  0x40, 0xc0, 0x40, 0x4f, 0x41, 0x0f, 0x08, 0x0f,
 /* AC */  0x40, 0xc0, 0x40, 0x48, 0x48, 0x0a, 0x0f, 0x02,
-- 
2.39.2