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-rw-r--r--src/southbridge/amd/rs780/rs780_gfx.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/southbridge/amd/rs780/rs780_gfx.c b/src/southbridge/amd/rs780/rs780_gfx.c
index 0f493f26d0..88cb935de8 100644
--- a/src/southbridge/amd/rs780/rs780_gfx.c
+++ b/src/southbridge/amd/rs780/rs780_gfx.c
@@ -660,8 +660,10 @@ static void rs780_internal_gfx_enable(device_t dev)
/* Set UMA in the 780 side. */
/* UMA start address, size. */
- /* The same value in spite of system memory size. */
- nbmc_write_index(nb_dev, 0x10, 0xcfffc000);
+ /* The UMA starts at 0xC0000000 of internal RS780 address space
+ [31:16] addr of last byte | [31:16] addr of first byte
+ */
+ nbmc_write_index(nb_dev, 0x10, ((uma_memory_size - 1 + 0xC0000000) & (~0xffff)) | 0xc000);
nbmc_write_index(nb_dev, 0x11, uma_memory_base);
nbmc_write_index(nb_dev, 0x12, 0);
nbmc_write_index(nb_dev, 0xf0, 256);