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authorWolfgang Denk <wd@pollux.denx.de>2005-10-09 00:33:37 +0200
committerWolfgang Denk <wd@pollux.denx.de>2005-10-09 00:33:37 +0200
commit95f9dda2165f045a7e1708885ee589878cc6f20b (patch)
tree4277d76deb33ba149865d4c0996f758b1991e8cc /cpu/arm920t
parent47340a46f6ff8be4f148b07bf42986c9054d8436 (diff)
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Eliminate hard-coded address of Ethernet transfer buffer on at91rm9200
Patch by Anders Larsen, 07 Oct 2005 The Atmel errata #11 states that the transfer buffer descriptor table must be aligned on a 16-word boundary. As it turned out, this is insufficient - it seems the table must be aligned on a boundary at least as large as the table itself (in Linux this is not an issue - the table is aligned on a PAGE_SIZE (4096) boundary).
Diffstat (limited to 'cpu/arm920t')
-rw-r--r--cpu/arm920t/at91rm9200/ether.c22
1 files changed, 8 insertions, 14 deletions
diff --git a/cpu/arm920t/at91rm9200/ether.c b/cpu/arm920t/at91rm9200/ether.c
index bff95b6..d88517f 100644
--- a/cpu/arm920t/at91rm9200/ether.c
+++ b/cpu/arm920t/at91rm9200/ether.c
@@ -44,21 +44,19 @@ typedef struct {
#define RBF_LOCAL2 (1<<24)
#define RBF_LOCAL1 (1<<23)
-/* Emac Buffers in last 512KBytes of SDRAM*/
-/* Be careful, buffer size is limited to 512KBytes !!! */
-#define RBF_FRAMEMAX 100
-/*#define RBF_FRAMEMEM 0x200000 */
-#define RBF_FRAMEMEM 0x21F80000
+#define RBF_FRAMEMAX 64
#define RBF_FRAMELEN 0x600
-#define RBF_FRAMEBTD RBF_FRAMEMEM
-#define RBF_FRAMEBUF (RBF_FRAMEMEM + RBF_FRAMEMAX*sizeof(rbf_t))
-
-
#ifdef CONFIG_DRIVER_ETHER
#if (CONFIG_COMMANDS & CFG_CMD_NET)
+/* alignment as per Errata #11 (64 bytes) is insufficient! */
+rbf_t rbfdt[RBF_FRAMEMAX] __attribute((aligned(512)));
+rbf_t *rbfp;
+
+unsigned char rbf_framebuf[RBF_FRAMEMAX][RBF_FRAMELEN] __attribute((aligned(4)));
+
/* structure to interface the PHY */
AT91S_PhyOps PhyOps;
@@ -153,9 +151,6 @@ UCHAR at91rm9200_EmacWritePhy (AT91PS_EMAC p_mac,
}
-rbf_t *rbfdt;
-rbf_t *rbfp;
-
int eth_init (bd_t * bd)
{
int ret;
@@ -188,9 +183,8 @@ int eth_init (bd_t * bd)
p_mac->EMAC_CFG |= AT91C_EMAC_CSR; /* Clear statistics */
/* Init Ehternet buffers */
- rbfdt = (rbf_t *) RBF_FRAMEBTD;
for (i = 0; i < RBF_FRAMEMAX; i++) {
- rbfdt[i].addr = RBF_FRAMEBUF + RBF_FRAMELEN * i;
+ rbfdt[i].addr = rbf_framebuf[i];
rbfdt[i].size = 0;
}
rbfdt[RBF_FRAMEMAX - 1].addr |= RBF_WRAP;