Hi,
the AT91RM9200 on-chip Ethernet interface is explicitly initialized to use promiscuous mode.
This is probably due to a bug in line 183 of cpu/arm920t/at91rm9200/ether.c which was supposed to clear the statistics counters but instead erroneously disabled reception of broadcast packets - so the driver later enables promiscuous mode in order to receive such broadcasts, like e.g. DHCP responses.
The patch below fixes the original bug and lets the interface run in normal (non-promiscuous) mode, which should improve performance on networks with heavy traffic.
Cheers Anders
CHANGELOG: Fix the initialization of the AT91RM9200 ethernet interface to use non-promiscuous mode Patch by Lars Munch, 24 Oct 2005
Signed-off-by: Anders Larsen al@alarsen.net
---
cpu/arm920t/at91rm9200/ether.c | 5 ++--- 1 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/cpu/arm920t/at91rm9200/ether.c b/cpu/arm920t/at91rm9200/ether.c index 67008d0..46dd36c 100644 --- a/cpu/arm920t/at91rm9200/ether.c +++ b/cpu/arm920t/at91rm9200/ether.c @@ -180,7 +180,7 @@ int eth_init (bd_t * bd)
*AT91C_PMC_PCER = 1 << AT91C_ID_EMAC; /* Peripheral Clock Enable Register */
- p_mac->EMAC_CFG |= AT91C_EMAC_CSR; /* Clear statistics */ + p_mac->EMAC_CTL |= AT91C_EMAC_CSR; /* Clear statistics */
/* Init Ehternet buffers */ for (i = 0; i < RBF_FRAMEMAX; i++) { @@ -197,8 +197,7 @@ int eth_init (bd_t * bd) p_mac->EMAC_RBQP = (long) (&rbfdt[0]); p_mac->EMAC_RSR &= ~(AT91C_EMAC_RSR_OVR | AT91C_EMAC_REC | AT91C_EMAC_BNA);
- p_mac->EMAC_CFG = (p_mac->EMAC_CFG | AT91C_EMAC_CAF | AT91C_EMAC_NBC) - & ~AT91C_EMAC_CLK; + p_mac->EMAC_CFG &= ~AT91C_EMAC_CLK;
#ifdef CONFIG_AT91C_USE_RMII p_mac->EMAC_CFG |= AT91C_EMAC_RMII;