The StarFive JH7100 SoC has peripherals that only support 32-bit DMA

(in particular the dwmmc(4) and dwge(4) devices; there may be more).

ok jsg@

diff --git a/sys/arch/riscv64/stand/efiboot/efiboot.c b/sys/arch/riscv64/stand/efiboot/efiboot.c
index 561bf69..fc94f6f 100644 (file)
--- a/sys/arch/riscv64/stand/efiboot/efiboot.c
+++ b/sys/arch/riscv64/stand/efiboot/efiboot.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: efiboot.c,v 1.4 2022/03/22 10:33:50 kettenis Exp $    */
+/*     $OpenBSD: efiboot.c,v 1.5 2022/06/06 10:50:56 kettenis Exp $    */
 
 /*
  * Copyright (c) 2015 YASUOKA Masahiko <yasuoka@yasuoka.net>
@@ -466,10 +466,10 @@ efi_dma_constraint(void)
 {
        void *node;
 
-       /* Raspberry Pi 4 is "special". */
+       /* StarFive JH7100 has peripherals that only support 32-bit DMA. */
        node = fdt_find_node("/");
-       if (fdt_node_is_compatible(node, "brcm,bcm2711"))
-               dma_constraint[1] = htobe64(0x3bffffff);
+       if (fdt_node_is_compatible(node, "starfive,jh7100"))
+               dma_constraint[1] = htobe64(0xffffffff);
 
        /* Pass DMA constraint. */
        node = fdt_find_node("/chosen");