Many thanks for sharing this tip!!!

Michael.

The only problem I had was with ethernet connection not working (Linux displayed it as “up”, but not “running”). Some initializations from U-Boot are required before the Linux kernel can use it (on the method at91sam9260ek_macb_hw_init() )

I have isolated and replicated the required initialization for AT91Bootstrap in the following code:

Please note reading the mac address from flash and seting it’s registers (SA1L and SA1H) is not required – Linux will create a new random mac address if you don’t

#define AT91_RSTC_KEY 0xA5000000
#define AT91_RSTC_MR_ERSTL_MASK 0x0000FF00
#define AT91_RSTC_MR_ERSTL(x) ((x & 0xf) <<
#define AT91_RSTC_CR_EXTRST 0×00000008
#define AT91_RSTC_SR_NRSTL 0×00010000
static void mac_init() {
//Read the MAC address from NAND
unsigned long* MAC = (long*) JUMP_ADDR;
long erstl;
load_nandflash(CONFMAC_ADDRESS, CONFMAC_SIZE, (unsigned long)MAC);

//Store the MAC address on it's registers
writel(1 << AT91C_ID_EMAC, AT91C_PMC_PCER);
writel(MAC[0], AT91C_EMACB_SA1L);
writel(MAC[1], AT91C_EMACB_SA1H);

//Reset MACB Controoler. copied from U-boot method at91sam9260ek_macb_hw_init()
writel(
AT91C_PIO_PA14 |
AT91C_PIO_PA15 |
AT91C_PIO_PA17 |
AT91C_PIO_PA25 |
AT91C_PIO_PA26 |
AT91C_PIO_PA28,
AT91C_PIOA_PPUDR);

erstl = readl(AT91C_RSTC_RMR) & AT91_RSTC_MR_ERSTL_MASK;

writel(AT91_RSTC_KEY | AT91_RSTC_MR_ERSTL(13) | AT91C_RSTC_URSTEN, AT91C_RSTC_RMR);

writel(AT91_RSTC_KEY | AT91_RSTC_CR_EXTRST, AT91C_RSTC_RCR);

while ( ! (readl(AT91C_RSTC_RSR) & AT91_RSTC_SR_NRSTL) )
{ }

writel(AT91_RSTC_KEY | erstl | AT91C_RSTC_URSTEN, AT91C_RSTC_RMR);
}

I hope this tip will be useful for someone else

Paulo