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arm: ip_k66f: Introduce board specific linker.ld file

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This patch introduces linker.ld file specific for ip_k66f board.
It reuses the "common" linker script for other NXP SoCs with defined
NETWORK_RAM_SECTIONS() macro for explicit placement of network
interfaces on ip_k66f board.

grep -A13 net_if_area zephyr/zephyr.map
net_if_area 0x00000000200012a0 0x820 load address 0x0000000000024ac4
            0x00000000200012a0                _net_if_list_start = .
*(SORT_BY_ALIGNMENT(._net_if.static.dts*))
._net_if.static.dts_ord_51
          0x00000000200012a0 0x208 zephyr/libzephyr.a(eth_mcux.c.obj)
*(SORT_BY_NAME(SORT_BY_ALIGNMENT(._net_if.static.dsa_slave*)))
._net_if.static.dsa_slave_port_DT_N_S_soc_S_spi_4002d000_S_dsa_0_S_lan_1
          0x00000000200014a8 0x208 zephyr/libzephyr.a(dsa_ksz8794.c.obj)
._net_if.static.dsa_slave_port_DT_N_S_soc_S_spi_4002d000_S_dsa_0_S_lan_2
          0x00000000200016b0 0x208 zephyr/libzephyr.a(dsa_ksz8794.c.obj)
._net_if.static.dsa_slave_port_DT_N_S_soc_S_spi_4002d000_S_dsa_0_S_lan_3
          0x00000000200018b8 0x208 zephyr/libzephyr.a(dsa_ksz8794.c.obj)
          0x0000000020001ac0                _net_if_list_end = .

As a result the eth0 (master DSA interface) is explicitly placed as the
first one (with the 'dts_ord_51' automatically assigned name) followed
by lan{123} interfaces (with 'dsa_slave_port' name assigned in
dsa_ksz8794.c).

After this patch network interfaces are explicitly placed in correct
order, so 'net_if_get_by_index()' will work correctly.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
This commit is contained in:
Lukasz Majewski 2021-03-30 12:27:53 +02:00 • committed by Anas Nashif
commit a186fabb56
1 changed files with 44 additions and 0 deletions
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boards/arm/ip_k66f/linker.ld Normal file
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/*
* Copyright (c) 2021 DENX Software Engineeering GmbH
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief Linker command/script file
*
* This is the linker script for ip_k66f board to allow ethernet
* interfaces placement.
*/
/*
* Explicit placement of the ethernet interfaces
*
* eth0 is the "master" port for the DSA switch and hence shall be
* placed on the index (position) 1 (as net_if_get_by_index() uses
* internally '_net_if_list_start[index - 1]' linker generated symbol).
*
* lan{123} shall be placed afterwards (sorted) so the order will be
* correctly preserved.
*
* If ip_k66f have had eth1 interface - it shall be placed afterwards
*
* The last entry with `._net_if.static.*` is to accommodate ethernet
* interfaces created in tests/samples - like e.g. _net_if.static.eth_test)
* in tests/net/vlan/src/main.c
*/
#define NETWORK_RAM_SECTIONS \
SECTION_DATA_PROLOGUE(net_if_area,,SUBALIGN(4)) \
{ \
_net_if_list_start = .; \
KEEP(*(._net_if.static.dts*)); \
KEEP(*(SORT_BY_NAME(._net_if.static.dsa_slave*))); \
KEEP(*(SORT_BY_NAME(._net_if.static.*))); \
_net_if_list_end = .; \
} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION) \
Z_ITERABLE_SECTION_RAM(net_if_dev, 4) \
Z_ITERABLE_SECTION_RAM(net_l2, 4)
#include <arch/arm/aarch32/cortex_m/scripts/linker.ld>