nvram_write
ssize_t (*nvram_write)(char *buf, size_t count, loff_t *index);
rc = ppc_md.nvram_write((char *)&info, sizeof(info), &tmp_index);
rc = ppc_md.nvram_write(buff, length, &tmp_index);
rc = ppc_md.nvram_write((char *)&phead, NVRAM_HEADER_LEN, &tmp_index);
rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index);
ppc_md.nvram_write = core99_nvram_write;
ppc_md.nvram_write = opal_nvram_write;
rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index);
ppc_md.nvram_write = pSeries_nvram_write;
ppc_md.nvram_write = mmio_nvram_write;
ret = nvram_write(tmp, count, ppos);
if (ppc_md.nvram_write)
return ppc_md.nvram_write(buf, count, ppos);